Jump to content

How to open this monobloc vacuum watch


Recommended Posts

Hey everyone, 

I need to service this monobloc watch but couldn't figure out how to open it, I read that the bezel is screwed down and I need to unscrew but don't know how to proceed, are there special tools for this? Or should come up with something? Please help with any advice and tips.

Thanks alot 

0524181837b.jpg

0524181837a.jpg

Link to comment
Share on other sites

I haven't worked on this model but I would proceed as follows.

1. Try to pop off the square bezel by inserting a sharp knife (paper cutter) between it and the case (be careful not to cut yourself).

2. If this doesn't work, remove the crystal with a crystal lift (claw).

3. Once either step 1 and 2 are successful, try to locate a stem release in the gap between dial and case. Pull the crown thru all positions as sometimes the stem release will only be visible in one position. If you can't see any visible release then its probably a two piece stem and will need a hard pull to be disconnected.

Some pics of the caseback would be nice.

Anilv

Link to comment
Share on other sites

10 hours ago, anilv said:

I haven't worked on this model but I would proceed as follows.

1. Try to pop off the square bezel by inserting a sharp knife (paper cutter) between it and the case (be careful not to cut yourself).

2. If this doesn't work, remove the crystal with a crystal lift (claw).

3. Once either step 1 and 2 are successful, try to locate a stem release in the gap between dial and case. Pull the crown thru all positions as sometimes the stem release will only be visible in one position. If you can't see any visible release then its probably a two piece stem and will need a hard pull to be disconnected.

Some pics of the caseback would be nice.

Anilv

Thanks Anil,

The bezel is screwed down, I read it on another forum, the crystal is a flat mineral and is flush with the bezel. I was thinking of pulling the stem out and do the syringe thing but I don't think it's gonna work.

I will post Caseback pics later.

Thanks again

Link to comment
Share on other sites

I doubt that the bezel is screwed down. Unliklu because, among other reasons, that makes it difficult to tighten it properly while maintaining a 90 deg alignment to the square case.

Link to comment
Share on other sites

32 minutes ago, Fred said:

Thanks Anil,

The bezel is screwed down, I read it on another forum, the crystal is a flat mineral and is flush with the bezel. I was thinking of pulling the stem out and do the syringe thing but I don't think it's gonna work.

I will post Caseback pics later.

Thanks again

   bezel or back,  wrist or pocket watch,   determining wether pop-off or screw down  is not allways easy to dertermin with out causing damage to the watch case.  what was the web site that info. please.  vin

Link to comment
Share on other sites

5 minutes ago, vinn3 said:

   bezel or back,  wrist or pocket watch,   determining wether pop-off or screw down  is not allways easy to dertermin with out causing damage to the watch case.  what was the web site that info. please.  vin

http://forums.watchuseek.com/f11/%2410-flea-market-find-le-jour-442495.html#/topics/442495

It says the bezel is screw on. The bezel has damage and it's misaligned.

Link to comment
Share on other sites

12 minutes ago, jdm said:

Without pictures you can't be aure it's the same watch. I can understand a round screwed bezel, but less a square one. Of course I can be wrong.

Let's assume it's screwed, how would you screw it down? What tool to use?

0525181204.jpg

Link to comment
Share on other sites

May not provide sufficient torque but a rubber tool like one to remove camera lens retaining rings will be fairly gentle to the case. Can pick them up on eBay cheaply9pcs-lot-Generic-Camera-Lens-Rubber-Lens-Repair-Tool-Set-Ring-Filter-Removal-for-Camera.jpeg

Sent from my Redmi 4X using Tapatalk

  • Like 1
Link to comment
Share on other sites

3 hours ago, JBerry said:

May not provide sufficient torque but a rubber tool like one to remove camera lens retaining rings will be fairly gentle to the case. Can pick them up on eBay cheaply9pcs-lot-Generic-Camera-Lens-Rubber-Lens-Repair-Tool-Set-Ring-Filter-Removal-for-Camera.jpeg

Sent from my Redmi 4X using Tapatalk
 

     I use large o rings also.  vin

Link to comment
Share on other sites

Old (really old) Oyster Cases has the top bezel screwed on. But they were round... that’s why several Datejust models have that saw tooth bezel that persists. Now it presses on but the design originally used a tool to unscrew like the Case back.

if it must unscrew, I like the hardwood fixture idea. Sugar maple is probably good and fairly cheap. If it’s a chrome plated brass case, you may want to try something softer- perhaps Alder. 

If it does unscrew, it might be a metallic gasket, so it is compressed a known amount when the case is aligned... a rubber replacement may not test to the original depth rating. If that matters at all. 

Either way it’s interesting!

Link to comment
Share on other sites

Let's assume it's screwed, how would you screw it down? What tool to use?
0525181204.thumb.jpg.abc41f02427e90a04eaacb635923793b.jpg
You could try this ... duct tape on a plastic round support, sticky side outside.
You'll have to clean the glue from your caseback after but it works pretty well'
Here's mine I use when caseback openers don't work.

06c34eea4321ca971b8953f0706435c4.jpg

Envoyé de mon Moto G (5) Plus en utilisant Tapatalk

Link to comment
Share on other sites

On 25/05/2018 at 6:16 PM, Fred said:

Let's assume it's screwed, how would you screw it down? What tool to use?

0525181204.jpg

Unfortunately it's not a screwed case back.

It's a solid one-piece case and the bezel is screwed, with a gasket.

The waterpfroodness was obtained by wacuum sealing usig Argon.

See here : http://thewatchspotblog.com/?p=577

So you have to unscrew the bezel and remove the glass.

I think you still can use duct tape for that if you have a crystal press :

1 - chose a die that is just a bit larger than the crystal

2 - put some duct tape on it

3 - stick on the bezl+crystal, then press firmly and turn

It could work.

Important thing is that you have very low chance to get the waterproofness back without using a vacuum chamber.

I dont think the owner would dive with that watch but you'd better check with him.

Edited by manodeoro
Link to comment
Share on other sites

24 minutes ago, manodeoro said:

Unfortunately it's not a screwed case back.

The OP is aware of that, in fact he's asking how to unscrew the bezel.

Quote

Important thing is that you have very low chance to get the waterproofness back without using a vacuum chamber.
The waterpfroodness was obtained by wacuum sealing usig Argon.
See here : http://thewatchspotblog.com/?p=577

That makes no sense, and is not what the blog says. Water resistance is obtained by a given construction and use of gaskets. In fact, if a watch was to be cased in vacuum, it would be subject to positive pressure right away. Not a good thing.

What the article says is that certain watches are cased in inert gas chambers to avoid the possibility of condensation from humid air. The real necessity of such practice is debatable, since all the other makers and repairers obtain the same result by casing in dry air using simple methods.

Link to comment
Share on other sites

35 minutes ago, jdm said:

The OP is aware of that, in fact he's asking how to unscrew the bezel.

 

That's what I proposed ... a way to open the bezel.

I know my duct-tape method could sound weird and far from professional but it works on almost all screwed casebacks ... so why not on a screwed bezel ?

35 minutes ago, jdm said:

 

That makes no sense, and is not what the blog says. Water resistance is obtained by a given construction and use of gaskets. In fact, if a watch was to be cased in vacuum, it would be subject to positive pressure right away. Not a good thing.

What the article says is that certain watches are cased in inert gas chambers to avoid the possibility of condensation from humid air. The real necessity of such practice is debatable, since all the other makers and repairers obtain the same result by casing in dry air using simple methods.

My fault ... I should think a little before typing nonsense.

Link to comment
Share on other sites

1 minute ago, manodeoro said:

That's what I proposed ... a way to open the bezel.

I know my duct-tape method could sound weird and far from professional but it works on almost all screwed casebacks ... so why not on a screwed bezel ?

Have you ever tried to open a really tight caseback (many threads on the subject already)? Tape bunches, friction balls are out of question as well other common tools. Of course we can't know how tight is the OP one, maybe isn't at all.

Link to comment
Share on other sites

Have you ever tried to open a really tight caseback (many threads on the subject already)? Tape bunches, friction balls are out of question as well other common tools. Of course we can't know how tight is the OP one, maybe isn't at all.
Depends on how tight but yes some pretty tight dive watch cases.
Of course it can't compare to a bergeon tool but the only thing I can say is that the "duc-tape tool" works much better than the friction ball.

Envoyé de mon Moto G (5) Plus en utilisant Tapatalk

Link to comment
Share on other sites



  • Recently Browsing

    • No registered users viewing this page.
  • Topics

  • Posts

    • I used to be quite active on The Lotus Forum when I owned my Esprit. I was there for so long, Bibs asked me to be a moderator. I'm not sure how long I did that for, but I think I turned into the second longest serving moderator. When I 'handed back my keys', Bibs made me a Full Forum Member. Normally this is a paid membership. My reward I suppose for helping out for many years. Bibs (forum owner) is quite active on there and if I am not wrong, don't quote me in other words, I think he once said that the money from memberships didn't cover the running cost. He adds money himself to keep it going. Does Mark have any sort of subscription scheme on here? I'll admit that I never paid to be a member on TLF. I should have. I never did. I agree that it would be a good idea that there is some sort of contingency plan for this forum. I intend on becoming more active on here. Life has just been getting in the way recently. I enrolled on Mark's watch course and was keenly doing that, but even that has had to take a back seat for a while. I am looking forward to getting back into that and also starting to do work on the clocks that I have been amassing. To do that successfully, I see myself needing to lean on the other members here. If for whatever reason this forum was to close, I think a great many of us would struggle.
    • I think we are about there, if there were still lots out there then the cost of a watch from 5 years ago would be around the same as it is now (allowing for inflation). Given that the price has gone up several times over we can only assume that supply cannot keep up with demand so we must be at or past peak supply, especially if the trend continues. I see even places like Australia, Ukraine and even South America are selling watches on eBay, picking over their stocks, mixed in with fakes and Frankenwatches etc.
    • I understand the demand bit, the generation below me 30ish are too technology engrossed to own a mechanical watch and they just dont like old stuff. I also consider myself at the getting on age of 57 to be a rare find of someone that likes old stuff, i did buy an almost 100 year old book yesterday titled " The New Modern Home " printed 1929.  Cost me a quid. What i was trying to work out is if we have reached a volume peak of watches being discovered hidden in the back of drawers.  Those watches that were hung onto until they entered the hands of the non sentimental generation. 
    • Even for myself who only started getting into watch repair/servicing during COVID I have seen a huge jump in watch prices - we have a 404 channel on this forum. When I started you could relatively easily find a watch on eBay to restore and put onto the channel, however this is now almost impossible and the only feasible solution is to buy a job lot with an average price <4.04. Even watches sold for parts/spares are 3 or four times the price of only a few years ago. Why - Either Demand must have increased in order to push up the price, or supply is reduced. I think it is a little of both, I think that most watches in the UK/US may have been picked over, which agrees with most of what @Neverenoughwatches says so supply of all kinds of vintage watches, including tat is dwindling. As a double whammy I think that more people are wanting watches, either to work on, or as a way to differentiate themselves from the Apple Watch and FitBit crowd. The upshot is that half decent watches that require restoration are now $500 instead of $100 and cheaper watches (Seiko 5 etc) are now $50 instead of $10, and even Mumbai Specials and garbage are now pushing $50 each. When - how long will this last, I think that most of the people who are returning to mechanical watches are those that have previously experienced life without them and want to return to something with a bit of personality that doesn't buzz every 10 seconds on your wrist and tell you how many steps you have done today. i.e. the 30-40+ generation. My son who is 17 has several mechanical watches but only wears one on a special occasion and is obviously only aware of them at all in part due to my hobby. I asked him the other day how many of his friends wear a watch and he told me that some use a smart watch but most just use their phones. So as I see it, demand will start to fall once the sub-thirty crowd start becoming the majority and/or the older amongst us stop buying watches and switch our attention to mobility scooters and trying to remember our bank password. Price - I think this is here to stay, even if demand does start to drop as the older generation becomes to decrepit and stops buying and the younger generation isn't interested in buying, supply will become progressively less as time goes on as more vintage watches become lost or broken beyond repair. I think the prices will plateau at some point as an equilibrium is reached as reduced demand is balanced with reduced supply, i.e. less and less people buying less and less watches. Sorry for the long ramble!
    • Hi. Use a PVA based glue, gorilla glue it dries transparent then do as advised by Old Hippy, smoothe down using very fine  0000 wire wool and either French polish or beeswax for a finish.
×
×
  • Create New...