the reason why i ask is because the similar "M1/52" marking compared to the first one posted. I had never seen this type of broader M1/52 marking before.
Note that there are a few varieties of "M1/52" back die strike for aluminium. all the markings of "M1/52" on aluminium that i seen is of more slender lettering. here is an original one in advance collection :
Bookmarks