Triumph 1932 Ausin Four 750 cc 4 cyl sv

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Triumph  Austin 4   ca 1932   750 cc  four cylinder side valve  frame#808576

“ If they wont list one, I’ll build one myself” could have been the motto of the designer and builder of this remarkable Triumph. 
Or should we call it a Traustin?  
It was created by Chris Shorrock who was a successful manufacturer of superchargers. 
He was well known and many of his superchargers were used by manufacturers of high powered racing and sports cars.  
Shorrock superchargers were also  available to private buyers, though.  
The conversion was carried out in the thirties.
 The cycle parts are  probably CTT Triumph. 
The machine has been restored with care.