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There are two sets of numbers stamped on the sticker on the bottom: a purple 719 in a circle, and a black 2302. - I guess if the 2302 is the correct number (it has 4 digits), then it was made in the 2nd week of 73.
It looks like according to that article this actually was the first electronic digital clock radio. If the C4390 was made in 71, it makes since that the C4390B might show up in 73. (Although they look the same. - maybe that 719 stands for 1971?)
Last edited by Adam; 11-18-2011 at 03:03 PM.
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