This is the model 200, 1964 with JLO 148, ( MODEL ON LEFT ) the first model with brakes 
and a headlight.  The distinct "Powerflo transmission" was unique to the early machines as
it proved to be unreliable and was later changed to the pin clutch and weighted clutch on
the motor.  The weighted clutch had a steel bell cover  on it.  Other distinct features were the straight handlebars, steel snow flap, and sleigh similar to the Snow Traveller of 1963. The ball joint was now on the tractor portion and not on the pole of the sleigh.  Serial number started with 20000. Barrie Graham

THANKS BARRIE FOR THE GREAT PICTURE!