For example, serial number JT03074463 would break down as: Of those, JT is by far the most common on the pro-line instruments.
However, other Japanese facilities have been used, so it's not particularly unusual to see JD and JF prefixes.
Most Electromatic hollowbodies carry a KS designation, although KP was fairly common prior to about 2007.
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This is a very comprehensive history of the Fred Gretsch Company.
Subsequent research has unearthed quite a few inaccuracies in Scott's numbers, so any serial number guides cribbing from Scott are also incorrect.
The Gretsch-GEAR database exists to get it right: to document the actual serial numbers, to determine once and for all what was built and when, and to harness the collective knowledge of thousands of Gretsch fans to put the pieces together.
After World War II, some guitars had a serial number embossed on the head, but reliable numbers didn't really appear until the advent of the first labels, around 1949.