The WS11s were dated 1941. I believe this was the last year these sets were made. There's no indication of RCA involvement.
One thought crossed my mind was that Northern Electric, Marconi & RCA were big into manufacturing comm equipment before the war. Addison Industries (WS58) and Rogers-Majestic (WS27) built only home entertainment radios.
Documentation I have between Ottawa & the Canadian Army Overseas HQ in London refers to the WS19 as "Wireless Set C-19). Perhaps the three manufacturers made note of this and put the "C" in front of the S/N.
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