Jump to content

Movement id ?


Recommended Posts

Hi again...

 

Started to take apart an old (50’s ?) Stowa Sport and found a movement I can’t id. It looks like the pivot coming through the cannon pinion for the seconds hands is broken off. Will most likely be a challenge to find a replacement but to even try that I need some more details on the movement.

 

I ”think” I have seen something similar on the keyless side before but can’t remember...

 

I suspect it might be a PUW movement as I read that Stowa used these and Durowe during these times. But there’s so many PUW’s on Ranfft that I thought I might take a chance and through out the question on the forum.

 

Photos are attached.

 

8367e409c52d6ba21018afabd4475705.jpg7ff4cba0e5138e212ee6a49523e78336.jpg

 

 

Sent from my iPad using Tapatalk

Link to comment
Share on other sites

You are definitely on to something here...

Osco is a new brand name to me, never heard of that one before.

I did see the OS 66 stamp on the movement but had nothing to connect it with.

Thanks a lot, now I have a starting point for furthet investigation!




Sent from my iPad using Tapatalk

Link to comment
Share on other sites

Osco 66 seems to be the general opinion and I tend to agree.

Just took the movement apart and lucky me, I took some photos of the process. This is not your generic swiss design and I would likely have been lost in the assembly process.

Looks like there are actually parts to have. Cousins are fairly well stocked, at least for the Osco 65 parts that comes up when searching for the 66, so I guess they fit in between these movements.

The movement belongs to a very worn case but the dial is nice with passable yellowish patina, so I’ll try to give the thing a 2nd life.

Thanks again for all help!




Sent from my iPad using Tapatalk

Link to comment
Share on other sites

So far so good...

Movement is up and running decently with amplitude around 250 and close to zero beat error. Currently off by around +20 sec dial up/down so should be tweakable.

Photo as assembled in cleaned and a bit polished casing with new crystal and re-lumed hands is attached.

I guess I will have to get that centersec-wheel and fit a sec hand before the adventure is over...:-)

I like it when a 2,5 euro investment can be turned around to something decent.


1c809502531d9d0809a8d0f8488c6818.jpg


Sent from my iPad using Tapatalk

  • Like 1
Link to comment
Share on other sites

It seems I was too quick to pat myself on the shoulder here..

After a couple of days wearing and winding the watch, the winding started to hack and slip over.

Taking the rocking bar mechanism out, the problem seems to be that the square part of the winding stem that is supposed to fit in the square hole in the winding pinion is worn down or wrong from start and the stem slips over inside the pinion when you turn the stem to wind.

I attached a photo of the stem fitted inside the pinion and find it hard to believe that there should be that difference between hole and stem size.

Measuring the stem, it’s maybe 0,1 mm undersized relative the nominal for the Ronda 382 that’s supposedly the correct one.

Is it the wrong pinion?

If anyone has experience from similar rocking bar designs, I appreciate any feedback.
1387424cc1ab541410c37068214915da.jpg


Sent from my iPad using Tapatalk

Link to comment
Share on other sites

I ended up using a rounded punch on the edges of the pinion in the staking set to close the hole i tiny bit. This prevents the stem from rotating freely in the hole and winding now works ok.

Probably a bit unorthodox and maybe frowned upon...?

But I’d rather have a wearable working watch than chuckng it back in the drawer with the other hopeless cases. :-)






Sent from my iPad using Tapatalk

Link to comment
Share on other sites

Well since the square part of the winding stem almost fits diagonaly in the winding pinion I would lean towards that stem has a error more than 0.1mm. The square hole on the winding pinion looks nice and crisp.
The winding stem is probably not a correct one for this watch, but of course someone can have changed the winding pinion, likely not since it obviously fits in diameter towards the crown wheel on the rocker.

Link to comment
Share on other sites

That’s the strange part. Checked the stem again with micrometer and it’s more like 0,05 mm off the nominal for the specified stem.

I can visually see that the corners of the stem has been worn down slightly right where it touches the wheel.

If there had been less size diff between stem and wheel from start, this would never have happened.


Sent from my iPad using Tapatalk

Link to comment
Share on other sites



  • Recently Browsing

    • No registered users viewing this page.
  • Topics

  • Posts

    • Imm going to close the discussion by attaching the photo of my super-titanium after several vicissitudes finally working. Purchased as not working I replaced the battery and for a stroke of luck I found its semi-new solar panel which, having verified its operation, seems to recharge the accumulator perfectly. I had taken this watch almost by bet, with 40 euros I brought it back to life. The initial half idea was to resell it to finance another purchase, but.. it's definitely a nice item. It would need to check the impermeability but it's a pleasure to see it on the wrist 😃
    • In fact the secret is to go gently and find the way without forcing, and the movement enters without problems
    • Yea a have given it a full service this movement is chinese 2813 whats the lift angle for this movement does anyone knows  and how  do a remove the default  of 52 degrees on my timegrapher?   Hi you said my lift angle is default how do a remove this from my timegrapher?
    • Sure! Some very accomplished repairers never use epilame! I have often wondered if it is worth the trouble. Not using epilame will shorten the service intervals though, but that could be better perhaps both for the owner and the repairer!? Speaking of oiling, I just read this: After WWII in the 1950s the first Synthetic Oils came on the market. Most watchmakers did not rush to use these oils since they were bad for business now that the watch serviced with Synthetic oil would not come back to him for service for another 5-7 years he would lose a lot of income. ~Ofrei.com   Anyway, I wouldn't be surprised if it would be more correct to think of epilame as a binder rather than a repellant. Until convinced otherwise that's how I will think of epilame.
    • I read that same article last night  H.  I think epilame is too much headache for me, sources aren't always accurate, some conflicting. Such is the GRAVITY of this situation, Is it ok if i just STICK  to a thixotropic oil 🤣
×
×
  • Create New...