Hi Bob
Here's the chassis#, serial# & production# of the units I have.
TS-18 serial # 333570 (Nov 11 1949)
TS-4J serial # 52575 (Oct 11 1948
TS-18? serial # 301795 (Jun 2 1949) No chassis stamping on unit, but it matches up to be a TS-18
TS-4J serial # 68262 (Jan 26 1949)
TS-4J serial # 66171 (Feb 4 1948)
TS-4D? serial # 5932/27E90129 (Jan?) This unit has channel 1. All I can read is Jan in the lower right corner in the back
TS-4J serial # 63638 (Dec 2 1948) I have just this chassis for parts.
I hope this helps you out. Have a great day!
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