It was quite common for NATO members and allies to manufacture Warsaw ammunition, especially West Germany who developed and issued weapons/conversion kits in 7.62x39.
I have a few examples of Western European 7.62x39 from Belgium, Spain, Portugal, West Germany and England. The MOD 7.62x39 from England is probably the rarest and coolest IMO.
This ammo typically looks similar to 7.62x51 but shorter and is brass cased and marked with the NATO cross. Sterilized ammo was used/manufactured initially as 7.62x39 was difficult to come by in large enough quantities but this is extremely rare. I have one box of sterile 7.62x39 made for the DoD in the 60's which is brass cased and reads 7.62x39 in black letters on a white box, thats it. This sterilized ammo is impossibly rare and is similar to WWB 7.62x39 but has
absolutely no markings. Russia made both 5.56 and 7.62 NATO for the same reason. I have two boxes of Soviet 5.56 made during the mid 1970s which has 5.56 on the box and som cryllic writing and a lot number/date code. Its identical to older Wolf 55grn FMJ.I have heard rumours that the United States manufactured clones of M74 ammo during the mid to early 70's. During the early 70's, the USSR was very tight lipped about 5.45x39 and weapons/ammo were nearly impossible to divert. It wasn't until Afghanistan that this ammo was availible for diversion/testing. Supposidly, we weren't able to steal enough to adequatly test the weapon/ammo so we manufactured our own, on the down low. I have seen a picture of a brass cased 5.45x39 round, but never handled one. Before the wall fell, Soviet ammo was difficult to obtain in sizable quanities for testing/use so countries made thier own. Now that the cold war is "over"7.62x39 is widely availible and domestic manufacture isn't necessary. These stocks are old and have eiether been used or surplused. If you see "milspec" type ammo made by a Western European nation, its a safe bet it was made for this reason. Im not sure about a monatary value, probably whatever someone will pay for it. I collect ammunition, especially weird stuff....so someone like me may pay 20.00 for a box of 20-50 NATO 7.62x39 rounds.