That specimen, therefore, may well be the Mountain Cub, which was offered as 'trail' bikes, mostly to the American market. It is believed that the bright colours were intended to make machine and rider stand out from the suroundings so that they were less likely to become the targets of hunting parties out shooting game!
The model designation was T20SM and T20M Mountain Cub, 1964 to 1967.
It was developed from the T20SS and T20SC and the specification made the machine suitable for mixed on and off-road use.
However, the tank badge shown on your image is not the "Terrier" type of badge as fitted to the T20M. The one shown is a smaller version of the garden gate badge that my T100 now has.
Intriguing.
Martyn
PS - it seems to have a unit twin full width hub on the front rather than the skinny Cub wheel.
-- Edited by Cubber on Thursday 30th of July 2015 09:01:02 AM
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TTR250 but now a mobility scooter Budleigh Salterton