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It sounds pretty decent, surprisingly good high frequency response, probably comparable with other decent radios made in 1941-42. My 1950 Zenith has a similar speaker but with a permanent AlNiCo magnet and it sounds similar.
Ditto to what Tom said, high impedance speakers are rare here.
FWIW my oldest radio (Philco 624 - 1936 version) has a permanent magnet speaker but it is a battery operated set.
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