Old 02-26-17, 10:27 AM
  #5  
Metacortex
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Join Date: Apr 2011
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Bikes: Fillet-brazed Schwinns

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I concur with @rhenning that the 446 is most likely a mfr. part number. A more important number is the 4-digit no. stamped in the headbadge that indicates the day the bike was built.
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