Late to the game, though not a rocky fan
, but I did know Billy B was Derek Bainton, was the Roadie builder in the 80's for Rocky Mountain.
Only trials bikes that I remember about where the late 80's one's just called 'Trials'
I would guess the bike was 1992, possibly made in late 1991 when he was playing around with odd frame designs. Decals, paint looks 1992 and then somebody stuck any old stuff on it that was lying around. If it Canadian who was the trials show off for them back then ?
Given there are only two of these, they are one off's and custom. If not built under the thunderbolt/tantalus brand then it's a one of name given to a team/demo bike for show and not that important
Not as if the lush roadie frame in the vancouver museum has a name and I know I would rather have that frame it's a beauty