ahhh- one of the great mysteries. from what I understand it is somewhat rare and desireable and very random. It was etched into the glass by the factory, but did not necessarily come with any specific pacakge. Some cars had it with standard, or deluxe interior. Check out the firstgenerationfirebird.com website FAQ interior section. I have the "bird" glass on my 68 convertible with AC and standard interior.
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