[CR]Campy Porta Catena (sp?) dropout useful for dating frame?

(Example: Component Manufacturers:Campagnolo)

Date: Sat, 8 Dec 2007 15:00:39 -0700
From: "Doug Van Cleve" <dvancleve@gmail.com>
To: "Classic Rendezvous" <classicrendezvous@bikelist.org>
Subject: [CR]Campy Porta Catena (sp?) dropout useful for dating frame?

Howdy folks.

Does the presence of a right dropout with the threaded holes for the Porta Catena device narrow down the range of when a frame was most likely made?

Thanks and merry Christmas,

Doug Van Cleve
Chandler, AZ USA