Wade (email: ellenkerr at earthlink.net) owns this 57 BSA spitfire scrambler.
Frame # ca7a356.
Engine # ca10sr355.
He bought this bike on ebay, it was about to be outfitted for AHRMA motocross. Wade put a front end on it and new fenders. The rest is still a work in progress. It is a west Coast bike built July '57. Dispatched to Hap Alzana in August of 57. It may be called a 58 model even though it was shipped in 1957.