pickupsrule, Your window regulator is definitely not from a 1967-72 Chevy pickup when compared to a known original unit. Different style/design and I couldn't find anything on the web that showed Chevy used a square handle window crank drive during that time period.
Best guess is you have something from another brand. Sorry can't be more help.
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)