JGSDF's M41 were transported in 1960 from West Germany to Japan.( Those were M41A2).
All those were repainted of by an original olive drab color.They retired in 1981.
Unfortunately a few pictures of old JGSDF on web.
Do you want to know mark of any unit?
As for what you must warn, TASCA released JGSDF Decal, but those don't conform to it with a M41 period.