[Kenwood] Serial numbers - decoding

[Gary Danaher]

>Date: Sun, 24 Jul 2005 14:54:04 -0500
>From: "Ritch" <ka9dvl1 at comcast.net>
>Subject: [Kenwood] Serial numbers - decoding 
>To: <kenwood at mailman.qth.net>
>Message-ID: <000a01c59089$7689d170$9f4ea8c0 at Keren>
>Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>	reply-type=original
>
>Serial Numbers?
>is there a way to fihure out mfg. date from Serial number on a TS-570?
>ie. 612000XX ?
>Thanks Guys 
>KA9DVL 
>
>  
>
December, 2004

First digit minus 2 equals the year. Second two digits are the month. 
101000001 would be January, 1999.