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bidaci
 
I posted this in the classic forum with no luck. Maybe someone here can help. I have an old Columbia Twosome Tandem that I cannot reference the serial number for a date code based on the charts at Old Roads. The number is located on the head tube and is "5 066 1503". Any Ideas??

Thanks

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TandemGeek
 
Is that the only number stamped on the frame?

The reason I ask is I believe Columbia's SNs are all stamped on the right-rear drop-out and are sometimes obscured by the axle bolt. If the frame has been repainted the numbers can sometimes be buried under paint. Also, if memory serves, Columbia's tandems & bikes had serial numbers that began with two letters followed by five numbers, e.g., TR 06587, NU 03456 [minor edit]

Of course, once you find the number there's a pretty good chance that it won't be included in the standard serial number lists so you will probably need to contact Columbia's current owners to see if they have a record of it. However, I should note that the last person we corresponded with on the forum trying to decode the serial number / year of manufacture for a Columbia tandem bought on Ebay was unable to reach Columbia via Email to make an inquiry so I suggested they give them a call @ (413)562-3664 between 8am and 5pm EST. Never heard how that came out....

bidaci
 
I checked the dropouts, bottom of the frame, etc. I'll admit, very quickly since I already had found a number. I will look closely at the right rear dropout and see if one is hidden there. If all else fails I will see if Columbia can supply any info. I'll post any replies or answers from Columbia.

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