I saw one like this recently and was informed that there was a broken punch being used in 1982. That might be what you see here. Not saying that this isn't a RPM, but keep the broken punch in mind as well.
Edited to add image. Not the same MM displacement, but for reference.

Edited to add image. Not the same MM displacement, but for reference.

"Nummi rari mira sunt, si sumptus ferre potes." - Christophorus filius Scotiae
Edited by Bump111
01/12/2018 12:03 pm
01/12/2018 12:03 pm



























