Don answered the serial number question in the last post on the previous page: "Philco serial numbers were a silver sticker with black numbers. Usually One or two letters followed by 5 numbers." So it seems that the serial number of Dave's set is D07890.
I recall that we went through this stamped number deciphering in regards to the 48-1000.
http://www.videokarma.org/showthread.php?p=3063082
In regards to the TV-123 stamped numbers, I propose to break them apart this way:
10307 326 5 01
10307 020 6 04
10307 could be some code that identifies it as the TV-123 Chassis
326 and 020 could refer to the day of the year of manufacture (1-366)
5 and 6 identify the last digit of the year
01 and 04 identify the Run numbers
Just my guess.