[CR]Mystery fork / brake boss question

(Example: History:Norris Lockley)

From: <emeneff@earthlink.net>
To: <classicrendezvous@bikelist.org>
Date: Fri, 22 Feb 2008 12:46:26 -0800
reply-type=original
Subject: [CR]Mystery fork / brake boss question

Dear Listees,

I am familiar with various braze-on centerpull brakes, but I have not seen any with bosses that have a threaded male external center post such as this fork has :

http://ebay.com/<blah>

Does anyone recognize what brakes this fork may have been designed for ?

Curious,
Mike Fabian
San Francisco, CA