It was a DIY hip support cradle made by Dan Henry (of the route markers) slightly over a 1/2 century ago. It used a handle bar and webbing and was supported by a quill stem fitted into a shimmed seat tube.
This is the second post of this vintage photo today (yesterday now) and there's more about it and the inventor on
this thread.
BTW- here's
more on the man
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Last edited by FBinNY; 03-15-15 at 11:25 PM.