I got the grey spool from one of the poles of a line-post line which was being replaced in my area. The spool is marked on the bottom with USA and what appears to be a U. The CD 152 and the beehive I bought from a antique store. The CD 152 is marked Diamond, and the beehive is marked H. G. Co. (Hemingray Glass Company). What are the dates of the two glass insulators, and how much are they worth? Just curious.