Ray was asking about derailleur hangers and when they first appeared. I
should not be surprised to find french constructeurs brazing on various type
pre war as well as the ubiquitous Cyclo. I have a 1947 Gillott with a
Simplex hanger that has had the upper portion cut off and then brazed neatly
to the dropout. I have frames from from 1948 and 1950 with the same feature.
I believe the cast Simplex dropouts with hangers were available from 1950-51
so that figures.
Mark Stevens Evanton Scotland.