It is a Swedish 1896. Looks like it was issued to the 3rd Battalion, Infantry Regiment 23.
The other side should have one of the makers marks of: EAB for Eric Anton Berg; a crowned C
for Carl Gustaf; or EJEAB over anchor for Eskilstuna plant.
Swedish Mauser Bayonet for the M96 rifle. They seem to be fairly common bayonets but, I'm not sure on price . I think they've been discussed before IIRC, you may want to search. The majority that I've seen have had non-matching numbers and have been without the leather frog.
Hope that helps, YMMV