[CR]Help Dating SR rear derailleur

Example: Framebuilders:Masi
Date: Sat, 16 Feb 2002 23:01:13 -0500
From: "Steve Freides" <steve@fridayscomputer.com>
Organization: Friday's Computer
To: Classic Lightweights <Classicrendezvous@bikelist.org>
Subject: [CR]Help Dating SR rear derailleur

A rear Super Record derailleur that says "Patent Campagnolo", without the sometimes-found two digit number, would be from what year or range of years, please? It's on a bicycle bought in late 1977 so thereabouts would be my guess.

Thanks in advance.

Steve Freides
Ridgewood, NJ, USA, Earth