Hello,
"Gen" I would exclude. For coins from Osaka does not fit the front.
Possibly the sign would be "Sa" for the Sado Mint. Then, however, the front badly fits.
For the rest, the sign "Ashi" remains for the Ashio Mint. Front with Tiger-Tail "Kan" and "Ei" in the nisui style.
Nisui-Style - "Ei": the upper horizontal line juts out on the right easily.
Issue period about in 1741-1745.
The diameter would have been helpful. I think this he 23,5-24,5mm amounts.?
Greetings from Germany
pingu
ps: another 37 hours up to WMF Berlin

3 days in coins digging and hopefully what the new find...
