I can only provide one data point for a data base.
My original 09C (*Sept 17, 1969) Z28 / RS has the silver pn sticker and date code on the wiper motor.
photo is attached. Sticker PN: 5045605, also has '227 9 6 A' printed on it.
'227 9 ' might be the Julian date and year (15 Aug '69), which would correspond well to my mid Sept built car, but that's just a guess on my part.
If you begin a data collection on this, I'd suggest collecting the car build date, RS or not, PN on the sticker, along with the other data, and maybe we can begin to make sense of the information? eg.
Car build date RS? sticker PN? Stamped PN? Other codes
09C Y 5045605 N 227 9 6 A