Probably built around 1980. It had a campagnolo super record groupset, hub nut was stamped 81 and derailleur 82. Maybe a respray of an older frame, but my spidey sense says it's probably early 80s. Inconsistent frame features include front derailleur braze on mount and nutted (non recessed) brakes.
Craftsmanship is very good. Probably custom made with custom geometry, henry james lugs. British threaded BB shell and fork. 126mm rear spacing. Probably American built by unknown builder that had major talent and experience.

I still don't know what to make of the head tube decal and the name. I reached out to Bill Brunner by email but havent heard back. Did I miss anything?