Here a bayonet I picked up at a flea last month..
Mismatched scabbard, WW2 issue.

Jager Reg 3. 1915 date stamp

What would be a good asking price for this piece.

Thanks
george

full shot

date stamp

Nice WWI unit marking for a Jagaer regiment

Realistically you have a $30 bayonet & a $15 bard; the unit mark will more than likely triple those prices on ebay or similar.
To me the bayonet has value solely for that awesome unit mark; 1915 Erfurt is the most common maker of the typeII & that 2nd shot makes it look like some numbskull tried to sharpen it some? (a quality close up of the fullergroove at the ricasso area will help in an evaluation).
Depending on the blades condition I would place the value at about $100/125 maybe a bit more if that blade is not altered, as that is about as cool a unit mark as you’ll find, only a Garde or mg unit would be close in desirability and they pull close to $200 these days if nice…