This is a CD 126.3 no embossing which was probably manufactured by American Insulator Company. It is an interesting mould variant which I think is very tough to come by. I was lucky enough to purchase this insulator from Doug MacGillvary many years ago. See [ID=79523981] for additional information. I will also post a picture of the CD 126.3 No Embossing from Georgia along side the CD 126.3 mould variant.

Note: These where previously known as CD 126.2 They where moved to CD 126.3 in 2019. CD 126.2 is for straight side units