Original Superbird back glass or repop

[oldcarnut]

I was talking to DonC1 about getting a plug made and unwrapped my glass window to make a tracing to send once I figure out how bad the shipping will be to get the plug. The markings on the glass are as shown.  Was just curious as to whether it was an original or repop but either way its new.  As a side note, I got quoted from FedEx  $750 to ship from Canada to SC which was to steep for me and the UPS rep said I would have pay to go through a customs broker plus their quote of $250.  Has anyone used a different method of getting parts from there to the USA?

[Hemi Runner]

I only know of one source for glass back windows but I don't think it has those markings.