Sanne,
I am presuming the other 2 chassisnumbers you mention are the ones at Jakob's? Have you tried contacting the former owner of the C15 in Norway through Hanno or Jakob? It's a long shot, but you never know if they have more information or even the original chassis plate. That's how I re-united my chassis plate with my truck after 30 plus years in a scrapyard!
Alex
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Chevrolet C8 cab 11 FFW
BSA Folding Bicycle
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