67-69 Camaro Convertible windshield decode?

[KevinW]

After seeing an original windshield on ebay, I decided to look at the one that has been sitting on my SS for over 20 years. I bought it somewhere in the 80s, not sure where, but it did not come on the car and has junk yard writing on it.

It is a tinted 67-69 Camaro/Firebird Convertible windshield with the shaded top. the marking on the glass are as follows:

SHADED
SOFT-RAY
SAFETY PPG PLATE
AS-1 1-A7
LAMINATED
M23

It has a little wiper haze, but that should buff out

[RJ_RS_SS_350]

http://www.camaros.org/glass.shtml
This article suggests that PPG glass (bottom of page) is likely from a 67 or 68 firebird.  Check the A7 again, it should be a 2 or 3 digit date code, and the M23 probably should be M25.

[Kramer79]

Are there any guidlines that you experinced restores follow? Like certain judgement criteria - or is everything 100% original? I never even knew that the glass was coded, now my cracked windshield is making me nervous!