[CR]anyone know what this is?

(Example: Framebuilders:Chris Pauley)

Date: Thu, 6 May 2004 17:34:24 -0400
To: classic list <Classicrendezvous@bikelist.org>
From: "Roy H. Drinkwater" <roydrink@ptd.net>
Subject: [CR]anyone know what this is?

Asked on the ibob list:
>Anyone have any idea what this little dohickey did/does
>http://www.fixedgeargallery.com/2004/b/dilworth50.jpg

My guess is adjustable seat tube angle?

Roy "intrigued" Drinkwater
Lititz, PA