The Hawaiiana Numismatist ™

Results are in: 100th Anniversary Okinawan Immigration to Hawai’i

This coin is a Royal Hawaiian Mint issue.

1) Gov. Ben Cayetano struck the first coin at the Royal Hawaiian Mint. Star-Bulletin provides the evidence. Coin is shown in the article. http://archives.starbulletin.com/2000/08/22/news/wild.html

2) Hallmark on the reverse of the coin is RHM (bottom image).