In referring to 1 of 100, it sounds like it is a 732-series Beaumont. That would explain the lack of medallions on the seats (or door panels) because they weren't there to reuse on the new upholstery. It looks like a manual top car, judging by the lack of power top motor on the rear kick in the trunk. I have heard or read somewhere that in Canada for 67 the power top was standard on the Malibu (& Beaumont Custom) convertibles but optional on the Chevelle 300 & base Beaumonts.