Jerry,
The brake is shown on page 7 of Robert S Broderick's 1986 Dia-Compe Catalog (in the Wool Jersey Galleries). It is pictured there ONLY without a quick release lever. The notation for this model "SCH" describes it as: "for Bridgestone Cycle / Self Centering Mechanism"
Guess the, the SC mark would stand for "self-centering"
BOB HANSON, ALBUQUERQUE, NEW MEXICO, USA
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