Poljot Watch - identifying movement

[skinnb1]

I have this Poljot watch with a broken mainspring. It turns out that the mainspring has a T-end and I am trying to find a replacement. I am finding it difficult to determine the model number. The broken spring appears to be 1.5mm high and .11mm thick in a 11.2mm barrel (external). Cousins don't seem to have a similar mainspring with a T-end. I haven't found any indication on the movement as to what it is. I have looked at bidfun-db Archive: Watch Movements: ZIM 2608 which looks like the right thing except that this watch has 16 jewels and this item mentions 15 and 17 jewels. I obtained a mainspring barrel (complete) for a Poljot 2609 hoping it was a shared component but the barrel is 9.9mm (external). The outside diameter of the movement is 26.6mm.

So can anyone definitively identify the movement so that I can attempt to find a replacement mainspring?

Thanks.

 

[Bernhard J.]

Hi, a nice early movement, these were of quite high quality. I have a small collection of various early ones and the workmanship is remarkable. By the way, not a Poljot, but a Kirova. Cal. 1MCHZ.

However, I suppose that the barrel might have been replaced and that this perhaps contributes to your problem. The winding wheel on the barrel is engraved "Made in USSR", the original barrel (winding wheel) for sure did not have that.

Cheers, Bernhard

P.S.: Here a picture for comparison.

 

[Chris Radek]

Perhaps a Longines WL7 mainspring (for Longines 9LT) would work?

 

[skinnb1]

Thanks both for your help. I assumed the "Made in the USSR" came about because this watch was marketed in the West. The face also has "Soviet Union". I have gone ahead on the basis that it is a Poljot/Pobeda/Zim/Sportivnie 2608 and managed to source a mainspring from Bulgaria which seems to be correct.