I would guess WEINMANN. Their more modern "Carrera" model brake levers of the early 1980s used a contoured alloy body similar in shape to Campagnolo. Shown here is an example on the cover of a 1981 Weinmann catalogue. Notice the drilling pattern:
http://farm4.static.flickr.com/
Dia-Compe's "Grand Compe" levers of the mid 1980s had similar body styles too, although the drilling patterns I've seen differed from those on your lever blade.
BOB HANSON, ALBUQUERQUE, NEW MEXICO, USA
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