Boss mounted rear derailleur first introduced?

[Hilldodger]

Anyone know?

I'm trying to date a locally made frame but the boss mounted rech mech is throwing me a bit. I thought that this guy built his last frames in the very early 70's.

 

[fossyant]

Well, I think the only one who can help is Mickle - if you two don't know then there is bugger all us lot know.

 

[Hilldodger]

Well, I think the only one who can help is Mickle - if you two don't know then there is bugger all us lot know.

I am expecting Mickle to give me a date including year, month and day

 

[fossyant]

And hour and minute !

 

[Hilldodger]

I'm back to 1958 so my original thoughts of the frame being mid 60's is right.