Old Silver Coin/Bar From Japan ? (Likely Fantasy Mameita Gin)

The bay has more than a handful of these, from a few eras. Maybe you could find a match,

however, none with cast bubbles. Or are those counterstamps?

just realized the back was uploaded twice, here's the front.

Looks to be a fantasy mameita gin or similar.

Before the introduction of denominated silver coins in the early 1800s, Japanese silver currency was comprised of a large ovoid chogin (often 60+mm long and weighing 100+ grams) and the corresponding smaller (1-20g) mameita gin (directly translated as bean silver). Together they would be wrapped up in packages of specific weights, the mameita gin added with the chogin until the package was of the proper weight. Both chogin and mameita gin were given stamps corresponding to the current era; a money changer was trained to read these and know the purity of the silver and thus its buying power.

This is far too small to be a chogin, and looks too large to be a mameita gin. I have seen a lot of "fantasy" silver coins purporting to be either imperial mameita gin, or else regional clan pieces. I strongly suspect this is one such forgery, unless we are all off base and it is in fact from elsewhere in the far East.

A small lot of such fantasy issues is currently for sale, in fact:

https://www.biddr.ch/auctions/herit...610&l=626425

Perhaps S&V pg 77 is actually J&V pg 77.

Then it might be referring to page 77 of Jacobs & Vermeule's book "Japanese Coinage".

A member with a copy could check for you and let us know.