I am not old enough to have done so, but I think the Small Ring 98 Mausers were often used up to make up hunting rifles - a bit slimmer / lighter than the Large Ring Mausers? So finding one with receiver and barrel more or less intact is a bit unusual, in itself. Sort of like the 33/40 Mountain Troop rifles. The "#### on open" of the 98 seemed to be a great attraction over the "#### on close" 93 style. I have one done up with double "set" triggers, so I believe even the "pro's" in 1920's Germany liked to use them. If it is a GEW 98, you will find some differences in firing pin versus a K98, but relatively minor stuff, but makes for days of research!!!
Edit - 14-Nov-2021 - as per post below, I zoomed in on OP's picture and indeed the scroll appears to be KAR 98, not GEW 98 that I had presumed.