Hi -- I think this is more accurately a whist/ card counter / gaming token. The "Keep Your Temper" is advice to a card player not to get too angry while playing / keep your mind on the game.
This one sold for $15 but there are lots of varieties and the market can be up or down on them.
by Allen & Moore (John Allen and Joseph Moore in England 1840 - 1858), struck ca. 1853-1858 AD., Brass Token (22 mm / 4,05 g), Obv.: VICTORIA - REGINA / 1850, head of young Victoria facing left, A & M on truncation. Rev.: KEEP - YOUR TEMPER , a man playing cards at card table facing left, four coins or gaming token and cards on table. Don.......