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As I recall, all Philco serial numbers of the era were two letters, followed by five numbers on a small silver sticker with a black border.
As a history trivia item; Philco provided an update kit for the TV123 chassis. It was a load of parts including a flyback, healthier horizontal output tube, improved high voltage rectifier arrangement and a sub chassis to use two 5U4s as low voltage rectifiers in place of the 5V3. The easy way to spot the mod is to look for the sub chassis. It had a cable that plugged into the power transformer socket and was mounted at the bottom of the cabinet. It also included other circuit improvements. The kit greatly improved reliability and will indicate the quality of service the TV got in its early life.
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