Lot of 4 A T & T Bell Telephone Advertising Glass Dairy Creamers

Lot of 4 A T & T Bell Telephone Advertising Glass Dairy Creamers. Size of creamers is 1/2 oz. All 4 in super nice condition. Used in the old days in restaurant's for cream for coffee.​ They have cap seats and markings on the bottom of glass. Picked these up at the local auction house but don't know much about them.