Embossed Japanese Silver Tray in Shape of Ancient Gold Coin;

This is 6 5/8" long, 4 1/4" wide, ~1/4" deep, ~2.5 ozt. It was pressed from the front; the back shows much less detail, except for what I will call its 'hallmark', which was stamped from the back (pics 3 & 4).
Y'all will refer back to this item, as there are 3 other similar trays I'll be posting here (after my beauty nap). I once knew the name & history of the large coin this represents, but it's gone now.
I'm primarily interested in the 'hallmark': the small rectangular block above the joined-at-the-apex triangles in particular; it seems to contain at least 4 characters. Along with the triangular logo, those marks will, I hope, identify where an' by whom it was made (an' perhaps when, as long as I'm dreaming). If it were American I'd call it a Tip Tray...but I have no idea of its design purpose. Thanks for lookin'!

 

The coin is called a koban.

 

Yes...Thank you, MOS!

 

The top mark is pure silver, either Korea or Japan. “Pure silver” in Japan and Korea is typically .900 purity.

 

https://www.925-1000.com/Fkorea_01.html

https://www.925-1000.com/foreign_marks5.html

 

Very good, an' helpful...Thank you!

 

interesting item

 

A paulownia mon (crest) used to be that of the Imperial family, later it became the mon of the Toyotomi clan as well as some others:

https://en.wikipedia.org/wiki/Toyotomi_clan

The number of flowers and the position of the flowers is important when assessing which family mon it is.
I don't know how it is significant to this tray.

 

I'm liking your latest Japanese share's Whit-nice.