... I know some restorers that will take a correct dated glass and transfer it to another body.
So, going along these lines of discussion and using a date coded glass removed from an original, I noticed the "etching" of the code, at least in the example I am working with, is etched into the "silvering" layer, not on the outer surface. (there was previous conversations on "etching" a code ONTO a replacement glass, similar to what is done on windshields).
I will upload a picture of the etching with a few "backlight shots" to show what I am trying to write out.