BUMP!!!
Any more info out there??
I do have the 1965 Daily Car Reports for 1965 (thanks Mark!) They show the total number of cars built with a particular option. The DCR was issued on Sept 2, 1965, so I'd say 1965 production had ceased by that date. With my build date in the 3rd week of August, that puts my '65 in the last 3 weeks of 1965 production (at the most).
Does a later-built 65 GS exist???