Marking:
[Square-D logo in bowl]Color:
Cobalt blue
Notes:
Only the company logo (a D in a square) is found on all the Square-D ashtrays I have seen. It seems odd that no mention of the address of the factory or products made by the company are given.
Marking:
[Square-D logo in lower right corner]Color:
Black
Marrking:
[Square-D logo in bowl]Color:
Yellow glass with black markings
It is unusual for Square-D to make a glass ashtray since all their insulators were made of porcelain.