Time for another update. I lately stumbled on the Nissan / Datsun USA Technical service bulletin about the change of the hatch window rear defroster lines from Vertical to horizontal: Since i had been wondering why my cars (which were built close together) came with two different types of windows, which i figoured out lately, it cought my interest and i started to look closer. Car 1. SNR:  HLS30-56801came with old horizontal lines. Registered in March 1972 Car 2. SNR: HLS30-59660 came with Vertical lines.Registered in May 1972 Strange enough, the SNR of my (European spec) cars are one Digit shorter than the ones mentioned in (American) Service bulletin. Both…