Here is a picture of some of the weird strain insulators my father and I have. Left side: No Name Anchor type strain-Clear, B.C. Co. Brilliant O. Hex shaped-Smokey Clear, No name Ladder type strain-Clear, B.C. Co. Brilliant O. Ribbed-Off Clear. Right side: Marked Pat. Pend. Diamond shape-Clear, L.S. Mfg. Co./Newark NJ./ Pat. Apl'd For (Missing P error) Purple, Pat. Appl'd For (Birnbach Radio) Dog Bone type-Lt. Straw, L.S. Brach Mfg. Co./Newark NJ./Pat Appl'd For, Small letters and size-Clear.