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I have one that looks exactly like it. No definitive answer on the interwebs, but if yours has the same reticle features as mine, then its likely made for the 7.62x54R caliber.
I discussed the optic
here. View Quote
ok, so the manual that you listed in the original Files thread is different from the scope that you actually possess. The paper manual you listed described a standard PO 3,5x21 that's supposed to go on "standard carbines like Tiger or Saiga". It describes the proper zeroing procedure as well as explains the reticle. BUT. The paper manual, lists maximum shooting distance to 1000 meters, not 2000. this is strange.
Its hard to believe that they expect you to shoot out to 2000 meters using either 7,62x39 5,45x39 or even 7,62x54R.
the manual has a standard zero procedure that of 1P78 (kashtan) and PO 3,5x21 with a 400 meter zero.
the 2000 meter reticle is beyond me.