Before Delta brakes were offered for sale to the general public, a prototype was produced which was generally similar to the first run of Deltas, but differed in a few key features.  Shown below are rare photos of these seldom-seen brakes, which were unveiled in 1984 for one day and then withdrawn from public view.  These particular examples are from the collection of framebuilder Richard Sachs, who used these on a show bike.  Click on any image to see a larger version.

According to one account, only three sets of Delta prototypes were produced; we show photos here of two of those sets; the third is reportedly owned by Campagnolo.  

proto_deltas1.jpg (61465 bytes)
Smooth transition from caliper arms to the brake shoes
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This quick release mechanism was not used in the production models
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Overview of the prototype Deltas
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Interior workings appear similar to early Croce D'Aune models
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Another view of the internal workings
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Quick release and internals
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Covers had the Campagnolo logo engraved, not anodized
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 Another view of the quick release and internal linkage
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Brake shoes and pads
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The prototypes had this spring clip retainer; later versions used a cleaner attachment

Thank you to Richard Sachs for providing these photos

October 23, 2002--According to the person selling the Deltas shown below, this is one of only two sets in private hands (the other is the set owned by Richard Sachs).  These photos show some great details, including the engraved (not laser-etched) logo on the cover, and the quick-release mechanism that was dropped from production models.  
 

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