Shipped to H C Bartlett, West Yellowstone, MT, 1947. I also have rectangle heart molds with denominations.
History of MT gaming.
Pre-1937 it was all technically illegal (though rarely enforced).

1937-1950, gaming was okay as long as it was licensed locally.

1950-72, it was illegal.

1973, gaming was legalized state-wide (only poker, pan, and live keno).