Hi
Perhaps this could help you

“Maple Leaf Nippon”, dates back to 1891. Found in green, blue (shown) & magenta. Van Patten’s #52. This mark should be 1/4″ high. Known fake Maple Leaf backstamps are 1/2″ high.

Nippon Backstamps and Known Dates of Manufacture

best regards from Argentina
Mara

mvillanueva@educ.austral.edu.ar