[CR]Who can tell me about a "GUID" stem?

(Example: Racing:Jean Robic)

From: <PBridge130@aol.com>
Date: Fri, 7 Jan 2005 11:58:22 EST
To: classicrendezvous@bikelist.org
Subject: [CR]Who can tell me about a "GUID" stem?

Going through the old boxes, I found a stem marked "GUID" on both sides of the extension, marking heavily recessed into the extension. Reminiscent of Pivos of the late 60's or so, though I think it's more cleanly executed. Rather handsome. Loose in an Italian steerer, so I assume that it's French-sized.

Can anyone tell me anything about it? Common? Unusual?

Thanks,

Peter Bridge
DenCO