Mark M was used by Japanese Mint during 1930s and early 1940s.
M for Mint.
The earliest currently known time coordinate of mark M - March 1930.
The latest - April 6, 1943.
Showa Enthronement Commemorative Medal.
Luckily for us, dated packages can be found in the boxes of these medals...
japanese mark m
japanese medal mark m
japanese order marked m
mark m on japanese orders
marks of japanese manufacturers of badges
marks of japanese orders
osakamintosakamint mark m
