7.62x51

[harry mac]

Hi all. I went to an arms fair here in the UK over the week end and picked up 50 rds of 7.62 "NATO".
However, it's a bit of a mystery who made it and where.
The head stamp just reads 12 84, with the 2 numbers directly accross from each other.
No manufacturer code, and no NATO approved symbol.
The primer is crimped in with 3 stabs, and the laquer around the primer is either black, or a very dark purple.
Any ideas where and by whom it was made?

[browningautorifle]

See if you can find it here... Headstamp Codes International Ammunition Association