Anyone know what this teamsters stamp indicates? Does it mean the operator was in the union? Anyone else have a game with a teamsters stamp? I have a Key West originally sold in Seattle (Dunis Distributing) with this stamp, which expires in 1960. I recently saw another Seattle bingo on CL with the same stamp, also expiring in 1960. I assume purchasing the stamp provided some form of political/legal protection for the operator, but does anyone know more?