This just in from Mike Murphy RT340AUTO@AOL.COM:

RON THE PICTURE ( #22 ) IS BOBBY HARRIS FROM WINDSOR,NEW YORK. HE WAS THE FIRST FACTORY "NATIONAL MX " RIDER THEY SIGNED, TOM CLARK WAS THE WOODS GUY AT THAT TIME.
MIKE MURPHY

This piece of Sales literature shows the three basic models produced by Rokon in the beginning of the 340cc motorcycle evolution. I would guess these are 1975 models. Can anyone confirm this? Almost forgot, thanks to Wes Baker for the literature.