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The RCA is quite a bit larger, and uses larger components, which might have been cheaper to produce than the miniaturized parts used in the 500 series Zeniths. The larger speaker produced somewhat better sound than most of the pocket portables, although the oval speaker in the 500h Zenith is fairly decent.
For the record, the RCA is approximately 7"x4"x2" which equals 56 cubic inches, while the Zenith is only approximately 6"x 3.5"x 1.5" which is 31 cubic inches.
Another Zenith model, the royal 200 as well as the Emerson 888 and Westinghouse model H656P5 are similar sized "coat pocket" radios, more closely resembling the style and construction of thr RCA. I suspect that there were others that are similarly sized, using larger parts.
jr
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