NEC SOLI CEDIT
Don't think this is a Jäger cap, but a model 1917, as it is marked for Reserve Infantry Regiment 7.
The markings are "R.J.B.7" for Reserve Jäger Bataillon 7, but that won't save it from being a reproduction. Wrong materials, wrong construction, fake markings (incorrect size and fonts). It's not even a good reproduction.