It is a U.S. Kragsling. How long is it?
A lot of Trapdoor Springfield and Krag-Jorgensen slings were made by splicing sections of U.S. Civil War slings together. Your splice looks correct for one of these slings.
The early Krag slings usually run 64 and 1/2 inches to 66 and 1/2 inches in length.
In the early 1900's (1903 & 1904 IIRC) shorter, less bulky, versions of the sling appear.
Krag slings were in use as late as WW1. (U.S. Engineers in London, 1917).
Attachment 93103