I just got a Zorki 1 (c) export version with Jupiter 8 lens and matching leather case for the bigger lens.
According to sovietcams.com its a PM1080, the export version of the PM1075. Ther is also the note that some of them have been equiupped with the Jupiter 8 and a special leather case, starting with #174735.
fotoua.com lists it as Type 7b CT691 1952-54 (#125889 - #310527)
Mine has serial 219762, so probably 1953. The lens is from 1955.
Nothing special till now, but:
It has strap lugs, none of the 1(c) had them as far as I know.
It also has a flash socket on the front of the body and not on the to cover where later Zorkis had it. The leather case has been modified for the flash socket too.
I found this flash socket on 2 more Zorki 1 models currently for sale in Austria.
Any Zorki 1 with flash sync of strap lugs probably had them added after the camera left the factory. The "Double Zorki" with the name in Cyrillic and English tended to be finished better than the other models. There may have been some special cameras made at the factory for VIPs. I've heard of a Zorki 1 with a slow speed shutter dial on the front but as far as I know only one example exists. The Zorki2 was basically a Zorki 1 with strap lugs and a self timer. There were only about 10,000 Z2s made (I have one).