'Clean Bolt' --  Welcome to the KCA Forum. It sounds like you have an interesting Krag rifle. Nothing listed in the SRS data for #362866 in Mallory's "Krag Rifle Story", 2nd edition, appendix.

Your Krag was assembled around November or December,  1901.

The brass tag or disk suggests to me that your rifle was once in a museum, factory, or private collection. Institutions and 'spiffy' collectors use to do that for cataloging purposes.