I know that Schwinns with fillet brazed frames often have a serial number that predate the apparent model year by a few years. I suspect I have an extreme example of this. The serial number GJ805618 points to July 1973 but the bike matches the 1979 Paramount Tandem model T294 in all other aspects. It's Silver Mist with Phil Wood hubs, 15 speed Campy crossover drive and Mathauser brake pads. The photo below shows the GJ80 more clearly than the 5618, which led me to suspect it was made in 1980, but the Waterford site states that Paramount tandem production had ceased by the end of 1979.
So, do you think this is a frame that was brazed in 1973 and outfitted in 1979?
So, do you think this is a frame that was brazed in 1973 and outfitted in 1979?