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Both sets were introduced at the same time, and I suspect manufactured at the same time. The 621 was cheaper than the 630.
My speculation: RCA didn't know what the demand would be for either set when they were introduced. It quickly became obvious (by low sales numbers for the 621) that the public preferred the 630, and the 621 was discontinued. The basic lines of the 621 could have been designed by Vassos before or during the war, but, as Tubesrule pointed out, there is no way the cabinets could have actually been built before the war, due to the size of prewar electronic components.
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