I assume that these were given out to employees and their families that worked at the East Pittsburgh plant. Not sure how many different kinds there were, but I know these were both casted at Trafford Foundry not far from East Pittsburgh. The left one reads, "E. PGH. Divisions, Family Day 1953" and the one on the right reads "Westinghouse Electric, East Pittsburgh 1959." Note the insulators in the design!