1937 sunbeam Royal tandem

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jim777

Regular
Hi all, just retired from mechanical engineering background, and decided to have some fun with vintage bicycles, so I've bought a 1937 sunbeam Royal tandem, I was told the the gears, 10spd and brakes were 1977 vintage, I cannot for the life of me find a serial number, I've checked rear dropouts, bb,s seat flanges, down tubes, any information, of any kind would be greatly appreciated, thanks in advance, Jim
 

Poacher

Gravitationally challenged member
Location
Nottingham
Maybe take the fork out and look at the steerer tube?
 
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