[seanofjapan]

Oh that is a beautiful Mifune.

Unfortunately I can't put a date on it (but would agree with the "1950s" ballpark). With non-sports menko its almost impossible to narrow it down. With the baseball sets they were able to do it by the teams players were depicted with, but its hard to do the same thing with non-sports ones (which also don't have a catalogue yet).

The text on it says "Shichinin no Samurai", the Japanese title for Seven Samurai, so it would have to date to after 1954 (and might be close to that year since they usually made menko based on whatever was popular at the time).