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The 51S-1 is a quality communications receiver,
built mainly for commercial and military use. This unit was built between
1962 and 1963. The serial number is 18XX and the date on the calibrator
crystal is June 1962. The power cord receptacle has been replaced with a
standard 3-prong socket but is very nicely done and is the only modification
that has been done to the receiver. Osterman, in his book Short Wave
Receivers Past and Present, lists this receiver as scarce and notes that
the price for used ones are going from $1,100 to $2,100. He gives it a 5
star out of a 5 star rating system.
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