Help to identify this coin

[coinsmcr]

WEIGHT  2,33 gr
DIAMETER  22,5 mm

[bgriff99]

It is a Japanese mon (cash) with inscription Kanei tsuho.  That was used with plain reverse from 1636-1760's.   It belongs to a subset "Shin-Kaneisen" = new Kanei sen, beginning 1668.  Approximate date 1736-40.   It may be a private imitation, from size and casting.   This is not my area, so not able to give an exact attribution, if that's what you needed. 

[Figleaf]

I do not have bgriff's specialised knowledge, but the irregular border on the obverse and the inverse dent in the central hole are bizarre to me.

Peter

[bgriff99]

I do not have bgriff's specialised knowledge, but the irregular border on the obverse and the inverse dent in the central hole are bizarre to me.

Peter

The obverse being shifted, but not the reverse, is from a mold slip, then the coin was finished to conform to the reverse rims.

In soft metal coins, like tin, a one-side centerhole deformation can be from string wear.  In this case it is probably from the shape of a rod used to punch out the center.  That's not normal for official ones.   It may have been hammered too hard, and down to its handle.     

[coinsmcr]

Thank you very much