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Hi:

According to your #'s posted (DU1924 is the VIN), it's a 1963 650 cc Trophy as you stated. The 'TR6SS' is the model of the bike. At least the frame and motor block are

(Introduced in 1962 and offered through 1966 was the TR6SS model which sported a 2 into 1 exhaust but was otherwise similar to the road going model. The TR6SS used the cheaper K2F magneto rather than the competition K2FC used previously.) ('Wikipedia')

Hope this helps