[CR]what's the deal with these 50s dural rings?

(Example: Production Builders:Tonard)

From: "dan polito" <thepandle@hotmail.com>
To: classicrendezvous@bikelist.org
Date: Sat, 11 Feb 2006 11:53:19 -0500
Subject: [CR]what's the deal with these 50s dural rings?

all-

ebay # 7217959606

or

http://tinyurl.com/crfje

i have seen rings like these before, but never for sale. who made them, what bikes were they equipped on, etc?

thanks dan polito cold day with the wind in bloomington, indiana- of course i'm on a fixed