Japan used similar brass coins to China for many centuries. The coins were round with a square hole, and four characters on the obverse. The Japanese coins were known as “Mon”. In the 1800s, larger coins up to 100 Mon were produced. Rather than simply scale up the coin and make it larger, the 100 Mon coins are oval shaped, with the same square hole in the center:

Like Chinese coins, Japanese Mon coins were produced in Trees. EverlastingCoins.com has a page with some good photos of 100 Mon trees.

The Numista page for 100 Mon coins lists some interesting information. Although only officially produced in three mints, they were very profitable coins to make and were known to be produced in at least ten provincial mints. Just under 500 Million 100 Mon coins were officially produced. However, after Japan reformed its currency during the Meiji period, nearly 600 Million pieces were withdrawn, indicating that likely at least 200 Million were unofficially produced.