The barrel appears to be a WWII era WRA barrel that has had an insert put into the chamber by H&R to convert it to 7.62 x 51 use. That receiver would have been made in 1945. I am guessing someone looked up the Springfield serial number of 1612395 and came up with a date of 1943 which would have been correct for a Springfield of that serial number, but not for a Win-13 Winchester of that serial number.
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