When HGCO made the HGCO H domers, they made millions of them but relatively scarce are the ones that have the small, lowercase " o " embossing HGCo.This one is just that, one of the more uncommon and scarce variants. Insulator is in VVNM condition and has some light bubbly spit clouds behind and above embossing. Clean as a whistle and ready for display! $8 + $5 shipping in USA.