Your answer is located here at the following http://www.YellowJersey.org URL - in the 1978 Reynolds brochure... butted tubing originated in 1897 and 531db tubing was introduced in 1935.
http://www.yellowjersey.org/
Regards, Steve Neago
Cincinnati, OH
> I'd like to ask this list for advice that is outside my area of
> expertise: Was butted frame tubing commonly used in racing bikes
> around 1910? If not, was it available at all?
>
> Thanks for the advice.
>
> Jan Heine, Seattle