According to effectsdatabase.com Top Gear effects were designed and manufactured by Len Hawkes (owner of Hawkes Electronics and physics lecturer at Brighton Technical College) in Top Gear's Sussex premises in the '70s. The first pedals had gray or black panels, the Series-70 introduced in 1975 had a fibreglass box and red face plates.
This Series-70 Funky Fazer is among the rarest Top Gear pedals and quite an unusual phasing pedal... (more)
The Top Gear Fuzz and the closely related Fuzz Sustain are unarguably the most sought after... (more).
02/15/2017: entire set of early Boss pedals for sale, all silver screw, mostly transparent switch, mostly boxed, many come with instructions too. For details please inquire: e-mail