[CR] Alan serial numbers/dating?

Example: Framebuilders:Mario Confente

Date: Thu, 30 Jul 2009 20:52:37 -0700
From: Doug Van Cleve <dvancleve@gmail.com>
To: CR discussion list <classicrendezvous@bikelist.org>
Subject: [CR] Alan serial numbers/dating?

Howdy folks.

I am trying to figure out how old an Alan frame is from its serial number. I did some Googling, but didn't find anything useful. Do any of you know the secret or know of a web resource? The number in question is 439324.

Thanks, Doug

Doug Van Cleve Chandler, AZ USA

P.S. Would the Guerciotti branded ones have had a different serial number scheme? They seem to be as or even more common than the plain Alan versions...