You can ask the Karmann Company for the Body-Number.
The oldest known Karmann Kabrio 1949 from the Volkswagen Museum has got the Body-Number 15-00107. The man who restaured this car for the Volkswagen Museum gave me some Informatios when i restaured my Karmann Kabrio (1950 Body-Nr. 15-000557).
On interesting thing was a copy of the original "Wagenbegeleitkarte" from the Karmann Company (NOT from Volswagen!) They still have informations about our early Karmann Kabrios!
On the "Wagenbegleitkarte" from Karmann are many informations about the car 15-000107. The framenumber, the frontaxlenumber, the gearboxnumber, the colors, the interiour and of course the BODY-NUMBER.
Maybe you have got a chance!
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