I'm assuming mine has been cut down and no dovetail. It's a Model 1898 with SN is in the mid 400,000 range, so made some time in 1902/1903 I think.  I haven't taken a caliper to it yet to get the barrel diameter at the front sight, but that would somewhat answer my question.

BTW I need to make my "introduction" post at some point I guess :)  I'm very new to the Krag thing, but have been having a blast the last few weeks researching what I can to know what I've got.  I got a copy of Joe Poyer's  book, as well as the smaller Ian Skennerton "booklet", both of which have been useful.