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Can't find a new mainspring for my Russian watch


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I’d be surprised, but very happy, if anyone has the knowledge to help me out with the following.
 
I’ve bought a Russian watch having a Poljot 2614.2H movement (Cornavin Dolphin) on eBay  which I’m now servicing. My problem is that I need a new mainspring for it (or barrel complete) but I’m unable to find anyone who can supply it.
 
I found some other Poljot mainsprings on eBay and CousinsUK.com, but non for the 2614.2H. For example, on eBay I’ve found a mainspring for a 2609/2614B, and on CousinsUK.com I’ve found a barrel complete for the 2609. However, I have no idea whether those would be compatible with the 2614.2H or not?!
 
Here are the measurements of the mainspring I’m looking for:
Height: 1.15mm
Thickness: 0.12mm
Length: 330mm (approx.)
Inner Barrel Diameter: 10.48mm
 
I should also mention that it needs a “DB = Special Bridle” as specified by the Generale Ressorts catalogue on CousinsUK.com, which I’ve also browsed but with no luck. Below are some pictures of the barrel and mainspring I’m looking for.
 
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9 minutes ago, khunter said:

Have a look at cousins again, mainspring number 620770, non automatic (doesn't state which end it is tho), 1.15x.12x320x10.....you may be able to email them and confirm what type end it has.....

Unfortunately, as their documentations says: "If bridle type is not specified then it is a normal bridle"

And what I need is a DB bridle. Anyway, thanks for the effort!

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