In this picture of mugs and ashtrays the left side down was Porcelain Products and glass Knox Porcelain Co on the end, Next row was A.B. Chance Co. insulator mug, Arrow Electric Co. NN.Glass and in the front a brown and white General Porcelain Co. ashtrays. The rest were Lapp Porcelain Co. and a Line Material Co. in the back. The one large brown Lapp ashtray in front of the Line Material actually had a seperate porcelain base with it. The Chance mug is made from a U-653 insulator mold I think. Wish I still had that one and the two G.P.Co.'s.