Interesting forensic technique. The serial number on the barrel (matching) has no letter suffix, the serial number on my 1917 Artillery does have a suffix both places, Kenyon (p. 156) allows for this model to have a serial number with no suffix. I feel confident that this is not a ground-off suffix.
As far as why it -is- ground...one guess is as good as another at this point, I guess. I'm pleasantly astonished at the wide range of interesting and educational response from such a long-odds question [img]smile.gif[/img]
--Dwight
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