We hope this helps those out there looking for this information quickly.
We cannot stress enough that this is NOT a complete list.
“Crown (Square) Hand Painted Nippon”, found in green and green with red.
“Miyako Nippon”, we have only seen this in green (as shown). Please note the manufacturing defect that is going through the mark, this is the only pic we have of this stamp, sorry. “TS Fan Nippon”, we have only seen this in green (as shown).
I was told it looked like an early Mil-Spec with the NM serial number.M in Wreath Hand Painted (M stands for Morimura Bros, importers). “Rising Sun Nippon”, we have only encountered this in blue (as shown). Mark used since 1911, found in green, blue, magenta & gold colors. I need some help determining the manufature date of my SA.I'm not aware of anything in print regarding serial numbers and dates of mfg .