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You are looking at America's first mass-produced postwar television set. This set is considered the "Model-T" of television, and has a 13-channel mechanical rotary tuner, which includes Channel 1.
The Story About Channel 1
Most people do not realize that early US TVs had Channel One. Prewar electronic television sets had 3 or 5 channel tuners, which included Channel 1.
The FCC (Federal Communications Commission) reorganized the frequencies (several times) in the 1940s, and finally 'killed Ch-1' in 1946 by reassigning the Ch-1 frequency for non-TV use.
Postwar television sets built through 1947 had 13-channel tuners (starting with Channel One and ending with Channel 13).
The year 1948 was a mixture of 12 and 13 channel sets, and a few manufacturers even continued to sell 13 channel sets into 1949, as old inventory was being depleted.
After 1949, all VHF TV-set tuners were 12-channel. They started with Channel 2 and ended with Channel 13. By dropping Channel 1 from the tuner selector and starting at Channel 2, the remaining frequencies were unchanged, and TV sets did not become obsolete or require modifications.
1982 Article Written In Radio-Electronics About Channel 1