I saw, not only one of these Ward's rear disk brakes but?? I think I saw a Sears one as well. Interesting.

Check Sears everyone, this is bike boom stuff, for their merchandise they sold decades ago, they have some diagrams of some old bike parts:

Huret Allvit rear derailleur: HURET ALLVIT REAR DERAILLEUR Diagram & Parts List for Model 502476940 Sears-Parts Bicycle-Parts | SearsPartsDirect (none of the parts are available but it is still on their webpages)

See the few other diagrams they have, one at the least is Shimano: http://www.searspartsdirect.com/mode...4/1303200.html