My Norwood 69 RS has an early build date (don't remember the code but it is Nov. 68), so it was before GM was putting the X codes on the trim tag. However, behind the back seat there is the "X 1" mark. What does the X 1 mark designate for this car?

Thanks guys.

x-1 means it is a X11 car.

Norwood used the x code shorthand on the bulkhead before they started marking the cowl tags. Not sure when, but I think the whole model year. JohnZ?