I wonder if it was repainted Silver in order for it to be used in the factory parts' catalogue ?
This is known to have happened ; just look at the pilot 1970 Coronet R/T convertible which was built in April 1969 (!!) : originally it was EB5 Blue , but was repainted EW1 White in order for it to photograph better for the parts' catalogue of 1970 .
It seems the reds and blues didn't photograph well in black & white ( at least back then ) , as those colours obscured character lines and panels .
Perhaps your car was repainted as a "Spring Silver Special" and used as a promo for advertisements ?
