Just checked my original car glass once again concerning other markings in addition to the info I already have posted:
Quote
68 Bird with bird glass 03B 17543 68-22637 259 LOR F-F (now painted Mayfair Maize)
Have to state that there´s absolutely no other marking neither on the front side, nor the rear side glass. Nothing that looks like "PPG" or "Solid tempered". But then again my car shows the second design glass - as Vikki stated, will say the one with the curved bottom. Hope that helps...