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Old 01-14-22, 04:50 PM
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tkamd73 
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Join Date: Dec 2015
Location: Menomonee Falls, WI
Posts: 1,522

Bikes: 1984 Schwinn Supersport, 1988 Trek 400T, 1977 Trek TX900, 1982 Bianchi Champione del Mondo, 1978 Raleigh Supercourse, 1986 Trek 400 Elance, 1991 Waterford PDG OS Paramount, 1971 Schwinn Sports Tourer, 1985 Trek 670

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I assume you have already looked at the vintage Trek site, lots of exceptions for the serial numbers that start with N. As you think an outsourced bike, lots who know more then me, but my guess, 21” 1981 613, or 614 depending on the crankset.
Tim
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