It's not a coin, it's a good luck piece.
The first picture, with characters at 12:00, 3:00, 6:00 and 9:00 means "We wish you long life and riches"
長
貴 富
命
Literally:
long
expensive rich
life
The other side means "Peace wherever you go" (literally, "peace when you come or go". Read clockwise from the right.
出入平安
