I'm back 'North of Canada' and able to check my copy of Mallory's "Krag Rifle Story", 2nd edition, appendix tables.

No "SRS Hit" on #75478. It is sandwiched between #75439 (a model 1896 carbine issued in 1899 to Troop 'A' 1st Nevada Vol. Cav.) and #75618 (a model 1896 carbine sold 07/15/1922 from Raritan Arsenal).

There are lots of carbines on both sides of your number. Only a very small percentage of Krag serial numbers are actually documented in SRS Data.

Congratulations on your purchase. Pictures Please!

p.s. The model 1896 carbine front-sight blade is short and the "C" is not visible when the blade is installed in the base.