Thanks James, good to know. I just looked it up the serial number seems to correspond to 1957.
Quote:
For models 36, 37, 38, 49, 50 and pre model number versions.
1950 = start at 1
1952 = 7369 - 21342
1953 = 28916
1955 = 55050 - 75000
1957 = 117770 - 125000
1962 = starts at 295000
1969 = ends at 786544
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Serial is 123XXX, not sure how accurate this information is. Was non reversed threading used in 1957?