If you can find a 2270X with a serial before 200XXXX and applied U logo on the dial and does not look completely suss, ill eat my hat...
227XXXX serial is early 63, from the date stampings inside 204612 and 20366 casebacks (marked by month/year).
(1963 ran serials from 227-231XXXX approximately).
Earliest serial i have recorded for any reference Polerouter with an applied U logo on the dial is 202XXXX, which should be 1960.
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