Pobeda - Zim 2602 Movement

[icius]

Mr. Mailman brought this for me today.  Seems to be running fine,  a bit fast according to my Timegrapher.  Hopefully will just be a simple service and regulation.

 

 

[WillFly]

Vostok 2602s are good, solid workhorses. I have a Zim with that movement. Interestingly, it has a double screw on the crown wheel and a slightly different finish to the bridge plates - otherwise just the same.

 

http://www.willswatchpages.com/vostok-2602.html

[Geo]

Now that's an unusual timepiece, quite unique. No shock system on the balance, so don't drop this one! ;)

[icius]

Hah thanks Geo. I really liked the look of it. Hopefully my dropping days are behind me

[anilv]

My favourite thing about russian watches is that have a 'breguet overcoil' which you would only find on high end swiss movements. A few American movements have this too but similarly on their better models.

 

With this feature the overall size of the coils to not change .. in a typical movement without an overcoil the coils will expand and contract as the balance spins. This is seen as detrimental to good timekeeping.

 

Question.. are the two tabs at 12 and 6 part of the movement ring? Anything else holding the movement in? Looks like the clearances are a bit too generous.

 

rgds

Anil

[icius]

Anil,

I did notice the overcoil when I had the back off, pretty cool. I haven't had the movement out of the case yet, but yeah those two tabs appear to be it.

I keep seeing this in a lot of watches. The movements have obvious screw holes where screws would go to hold it into the case but they are not used. Why is this so?

[anilv]

Depending on case construction.. it may be neccessary to use the screws to secure the movement to the case (as in front loaders where the bezel is removed and the movt+dial is loaded thru the front).

 

Where are movement ring like yours is used, this is pretty much dependant on the dial being fixed securely to the movement. If the dial feet fails then the movement gets wobbly in the case.

 

Some watches fix the movement ring to the watch with screws or combinations of screws and clamps.. this way the ring provides secure location independant of the dial. Better swiss watches from use this but some lazy watchmakers leave them out when servicing the movement.

 

Anil

[icius]

Found out something else cool about this movement.  The balance wheel is made out of an alloy called "Glucydur"

 

According to Wikipedia:

Glucydur is a beryllium bronze; an alloy of beryllium, copper and iron. In addition to its low coefficient of thermal expansion, its hardness (400 Brinell), nonmagnetizability, and resistance to deformation and damage make it suited for making precision parts that must have high dimensional stability. Glucydur is also resistant to corrosion; it is rather inert chemically.

 

So that is kind of neat too.