Elitest Murray Owner
Join Date: Apr 2006
Bikes: 1972 Columbia Tourist Expert III, Columbia Roadster
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I've had a few Columbias with numbers starting with zeros, which doesn't fit neatly in with the numbers listed on sites that give reference to Columbia serial numbers. This style of frame discontinued by Columbia at some point in the 1960s, that and the N on the serial probably indicate that it is a 1963 model.
The style of frame you typically see on Columbia tandems is this one:
Columbia Twosome Tandem
, on Flickr
Notice the lack of a top tube on the front of the frame. This style was phased in at some point in the 1960s although I'm not sure exactly when, and I think that Columbia may have even produced both styles of frames simultaneously for a short while. They continued with this style until the mid 1970s.