Learn where the serial numbers are and find the manufacture date for your frame Phantom 
Schwinn Phantom  
Serial Numbers and Date coding 
In this section of the video, We show you how to identify the the serial number locations for your Phantom and give some history to the serial number mystery. On the Phantom frame which it's cantiliever design was patented by Schwinn long before the introduction of the Phantom, There are a couple common places you can find your serial numbers for your Phantom and those are no real secret. The first is on the underside of the crank hanger on the Phantom frame.  This indicates an earlier build date. Specific date ranges are given on the 'Restore your Phantom' video. 
The second serial number area for your Schiwnn Phantom might be located on the left side of the Rear Fork, where the Axel bolts on to the Phantom Frame. Again, in the video, we show you exactly where to look. 
Now later model bicycles 1970  on up will have serial numbers near the headbadge. But since those are not the original Phantom's we are looking to restore, If your phantom has the serial number by the headbadge, it's not very old. Perhaps it has been assembled from other parts. There are several things we show you so you can tell a Original Phantom apart from a built-up phantom.
Even if you have just a bunch of parts, you can find it's build date
I am currently transposing data to this Schwinn serial number database.. If  yours is not listed (probably not yet)
feel free to email me and I can look it up for you
Schwinn Serial numbers for 1948
Schwinn Serial numbers for 1949
Schwinn Serial numbers for 1950

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