Looks like a turk m1935 bayonet. You say it fits your 98? The high muzzle ring makes it impossible to fit on an ordinary 98, it will fit turk, spanish and some latin american mausers, but not the gew98/Kar98/K98k etc.
You have a M1903/30 Bayonet (some say M1903/35, but who's to quibble...it fits all the standard "Turk" 1930s Mausers.
It is made from an original M1903 Short Blade and hilt ( fullers complete, not a "cut off" longer blade), and the cross bar has had the quillon removed (Orig. M1903 have a slightly hooked quillon similar to thje South American export Mauser Bayonets.
The Cross bar has then been cross riveted in place, with highly visible rivets.
Scabbard could be original M1903 , or 1930s replacement. (check for Turkish script marks anywhere to date the item (Turkish script, pre-1928, i.e, original contract of 1903 etc.---no script, either completely scrubbed, or "new made "post 1928.(More than likely "scrubbed").