I have an early 70's Gitane Tour de France with Simplex Pro DOs without the hanger. No evidence of it being cut off, and they are forward-facing, not for a fix. Simplex seems to have made them with and without into the 70's. Maybe yours had the hanger bit added later.
Bob Reid wrote:
> I've currently got a Flying Scot frame from 1957 with Simplex frame ends -
> nothing unusual in that - but - the right-hand side looks for all the world
> like a mirror image of the left-hand but with the hanger portion having been
> brazed onto the underside rather than a one-piece assembly. It doesn't look
> like a repair and would not be otherwise noticeable if it were not devoid of
> paint. Was this common on Simplex frame ends or is it just a well executed
> repair following damage to the hanger ?
> Bob Reid