gregg says:

snip explanatory stuff, noted

Also FYI: MTB's were not in shops in the mid 70's

I know that _very_ well, I was just trying tot give you a few more years to
have accumulated bikes in. ;-)
I was riding knobbies on the dirt on a Sturmey-Archer 3-speed back in 1971/2 in
England. Believe me, if they had had anything in the shops that even looked
like that, I would have stolen one...

Steve