Borrowed Dwights words
Quote:
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Mid-1921 the commercial serial# series reached 92000. DWM converted commercial production to the military convention of numbering, four digits with letter suffix. Numbering began with letter suffix i , guns have upright c/N proofs. This is new designation Alphabet Commercial (formerly 1920 Commercial). (Not all sources agree with Still about the changeover beginning at serial# 92000.)
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So, what letters are looking like an 'o' from i to q
o
p
q
So, I would say since p was not used and q is questionable - that I agree with the above
