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Month/year would be on the 'Certification Label' Left Side door unless removed for a refinish later. An '86 is old enough now that specific date isn't required 'THERE' or is it?
If for just curiosity purposes you could post the last 8 digits of the VIN here and another '86 owner with a VIN close to yours that has a 'Build Sheet' for theirs and you could approximate from that. Purchase the 'Build Sheet' from the NCM(National Corvette Museum)
I will check out the door location, the car is a survivor car all original so should be there.
Just in case that it isn't there, the last 8 digits of my VIN are G5126829
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.