.50 BMG belt Link marking "12,7 R1M1"


I have this belt link with “12,7 R1M1” on it in my collection. But who was the manufacturer? Pretoria Metal Pressings in south Africa?
I had found this posting: viewtopic.php?f=1&t=6997


I have no proof, but I would agree with your assesmant of South African manufacture, as they have used similar on there .50 BMG headstamps…