sekonda case back

[berniethebolt]

hi.i have a sekonda 21 jewel mechanical wind watch( USSR) which has a back causing me a bit of trouble.it is a screw down sort,but it is a ring and the notches are quite tight and i have used a fair bit of force but it is not budging.i do not want to go overboard as i do not want to damage the case which is rolled gold and in reasonable shape.any thoughts?

[canthus]

Could be a press-on back made to look like a screw-on.  I have had one like that before.

[watchweasol]

Hi  The loose ring with the slots in unscrews and the flat back cover is removed.  check that its not a left hand thread.

[Nucejoe]

Bench top case back opener effectively helps do the job, no wonder Rolex calls its version openall.

The ring unscrews open.

[wls1971]

Its got quite a bit of verdigris and muck around the ring you could try putting some penetrating release spray on a cotton bud and rubbing around the ring to see if it free's it up.

[AndyHull]

3 hours ago, wls1971 said:

Its got quite a bit of verdigris and muck around the ring you could try putting some penetrating release spray on a cotton bud and rubbing around the ring to see if it free's it up.

I agree completely, this case back design is typical of a lot of USSR era Vostoks. 

The ring unscrews, and is often full of gunk, so a little penetrating oil will help to loosen that up. Once the oil has dissolved some of the organic (DNA?) material you should be able to spin the ring with a bit of pegwood. A screwdriver will almost certainly slip and mar the case. Some case back openers will adjust to fit the ring, and you do have to turn the ring, there is no point in attacking anything else as the ring is key to the whole shebang.

Take care when re-fitting as it is possible to cross thread the thing if you are not careful, and then your troubles really start.

See Mark's Vostok Amphibia/Komandirskie video ->

 

 

Edited October 29, 2020 by AndyHull

[berniethebolt]

14 hours ago, AndyHull said:

I agree completely, this case back design is typical of a lot of USSR era Vostoks. 

The ring unscrews, and is often full of gunk, so a little penetrating oil will help to loosen that up. Once the oil has dissolved some of the organic (DNA?) material you should be able to spin the ring with a bit of pegwood. A screwdriver will almost certainly slip and mar the case. Some case back openers will adjust to fit the ring, and you do have to turn the ring, there is no point in attacking anything else as the ring is key to the whole shebang.

Take care when re-fitting as it is possible to cross thread the thing if you are not careful, and then your troubles really start.

See Mark's Vostok Amphibia/Komandirskie video ->

 

 

thanks to all.i remember now i had a similar watch previously which was not a problem but i wanted to make sure so i will put on some penetrating oil and then see.will get back to you with the result and thanks again.B.