Any experience with this kind of case?

[avion]

Hi

Any experience with this type of caseback? It's not a usual snap and there arent any notches for a blade. 

Thanks

[Chopin]

Everyone should have one of this.

 

[Ishima]

doesnt look like a screw back case, perhaps a one-piece case where glass and winder are removed to de case.

[anilv]

I've worked on these cases..

The movement fits into a caseback and the crystal is fitted on the caseback. Then the whole assembly is press fitted into the upper case.

First check if the upper case does NOT go around the stem (in case my memory is faulty!). Then press on the crystal while supporting the lugs. If you're using your thumbs be aware that it can 'let go' suddenly.

The reason I remember these cases is that replacements crystals are not easy to source and I usually had to modify something to fit.

Good luck.

Anilv

[avion]

@ Ishima - no it's definitely not a screw type

@anilv - I'm not sure what you mean by "check if the upper case does NOT go around the stem". I'd be surprise if the method of pressing the crystal should be applied here since it's stated on the baseback " Benrus #2155 - Remove with blade"

[oldhippy]

If the back doesn’t come off, then it comes out from the front. It will have a two-piece stem. You pull the stem, lift off the glass and the movement can be taken out.

[avion]

Quote

If the back doesn’t come off, then it comes out from the front. It will have a two-piece stem. You pull the stem, lift off the glass and the movement can be taken out.

thanks. So something like in:

 

from minute 1:05

I need to use the blade after to take the bezel out ?

If so, I shall check if the stem is indeed a two-piece stem and let you know

[oldhippy]

Your bezel doesn't come off. To remove the glass you need one of these.

[avion]

Quote

Your bezel doesn't come off. To remove the glass you need one of these.

so again I'm curious regarding the directions written on the backcase stating " Benrus #2155 - Remove with blade"

[oldhippy]

Looking at photo 2 it looks to me as if the bezel is part of the case.

[vinn3]

first verify that you have a "two part" stem.  or take the crystal out with the "claw tool"  as illustrated above.  vin

[Ishima]

Be 100% certain there is no seem on either case back or bezel before proceeding, as avion alludes to, I do not think it would have "remove with blade" printed on it for no reason. 

Edited February 21, 2018 by Ishima

[MrRoundel]

12 hours ago, anilv said:

The reason I remember these cases is that replacements crystals are not easy to source and I usually had to modify something to fit.

Good luck.

Anilv

I'm glad to know that it's not just me. I've been going nuts trying to find a crystal to fit what looks to be a ladies Sea-Hawk, possibly aka, "Mermaid", for this type case. What makes it difficult for me is that the, at least arguably, most important dimension is the ID of the crystal, not the OD, as is the usual case. I've tried a couple of different sizes, without the step, and I'm getting close, but still don't have the dial covered yet. :-(  I don't remember it being as difficult with my men's Sea Hawk. But this ladies version is a tough one.

As far as the OP's watch, I don't know if it does need the Benrus press, but the company did make a special tool for their waterproof cases.  And yes, the watch back does say to use a "watch blade", so I have my doubts, as the Benrus tool is a screw-fed press, i.e. very un-blade-like. I have the tool, but still no crystal. Good luck.

[jdm]

2 hours ago, MrRoundel said:

As far as the OP's watch, I don't know if it does need the Benrus press, but the company did make a special tool for their waterproof cases.  And yes, the watch back does say to use a "watch blade", so I have my doubts, as the Benrus tool is a screw-fed press, i.e. very un-blade-like.

The press is to close the case, but to open it you go around the case back seam with a sharp blade. A normal "case knife" won't work. 

[avion]

On 2/21/2018 at 3:39 PM, vinn3 said:

first verify that you have a "two part" stem.  or take the crystal out with the "claw tool"  as illustrated above.  vin

After giving it a few shots I'm quite positive that this is not a two parts stem :/

Any other suggestions? Thanks!

[Watchtime]

looking at other 2155 of benrus, it seems to me it ia a backloader...with a very thin knife, you must be able to get the caseback off.

[oldhippy]

Some two-piece stems are sods to pull out. I used my nippers, pull the button out to set hands and with nippers behind give one hell of a tug.

[avion]

8 hours ago, Watchtime said:

looking at other 2155 of benrus, it seems to me it ia a backloader...with a very thin knife, you must be able to get the caseback off.

A backloader ?

 

[avion]

8 hours ago, oldhippy said:

Some two-piece stems are sods to pull out. I used my nippers, pull the button out to set hands and with nippers behind give one hell of a tug.

 

I used nippers and strong leverage. If it's a two parts, then it must be glued.

[oldhippy]

31 minutes ago, avion said:

I used nippers and strong leverage. If it's a two parts, then it must be glued.

Could be rusted in.

[MrRoundel]

After looking at the original image of the back of the watch, and the fact that the "Benrus" is slightly askew, I'm pretty convinced that this is a conventional "back-loader". It would be unforgivable of Benrus to have a crooked logo on the back of a one-piece front-loader, no? Of course, I  don't know that there weren't some sort of two-piece front-loaders made. If that's the case, I'm back to not-quite-square one.

[avion]

Good call back-loader supporters! My Swiss army Victorinox knife wasnt thin enough but the ikea salad knife was look how clean the mvmt (dr25) is!

I appreciate the group effort. Thanks

[vinn3]

good show !    vin

[oldhippy]

Sorry if I confused you about it being a two-piece stem. Glad you got it sorted.

[avion]

Its part of my learning experience. Now I know more about two parts stems so thank you