Originally Posted by
cheffyjay
the number on the bb is: 575.50.7611
seat post binder bolt is non metric 3/16 hex. that's handy.
That's a slack and handsome looking machine - and a bit against the grain for the period given that it isn't a full-on tourer.
By chance, is the seattube or top tube length 57.5cm? Trying to think of what the other digits may refer to. It can't be 11th bike of 1976 if that Henry James BB dates from the early 1980's.
-Kurt