1769-1859 Japan 4 Mon with 11 Wave Cash Edo Ginza Mint Tokugawa Shogunate Kan'ei Coin
Japanese Kan'ei Tsūhō: The Japanese Shogunate (military leadership) cast Bronze Cash style coins in 4 Mon denomination with two Types: 11 Waves (1769-1859) most were issued in 1769, there were 2 additional issues of this same type : Bunsei Coins issue in 1821-1825 and Ansei Kan'ei from 1851-1854 , and also a 1 year type (1768) with 21 Waves on the reverse.
For more details on this interesting series of Japan Shogunate Cash Coins, search and see wikipedia article: Kan'ei Tsūhō