Below are images of two Mexican .45 Auto caliber cartridge boxes from my collection. The orange box at top dates from 1938, with cartridge headstamp " - F DE M 45 AUT - 1938 “. The red box is from 1956, with cartridge headstamp " FNM45-A* 56”.
Below them are the side labels from the two respective boxes. Note the monogram-style markings on the orange 1938 box of “EFM” enclosed in a circle, and on the red 1956 box “OIM” (Possibly “DIM”).
Can anyone tell me the meaning of these two sets of initials. I could make an educated guess, but choose not to. I would like the meaning to come from someone who knows, and not just a guess based on knowledge of the Spanish language.
Any help appreciated, of course.