Hello and welcome to the forum!
It appears to be an original German M42 helmet, likely a repaint post war and missing the liner and pins. You will definitely get more opinions.
Searching for anything relating to, Anton Boos, 934 Stamm. Kp. Pz. Erz. Abt. 7, 3 Kompanie, Panzer-Regiment 2, 16th Panzer-Division (My father)
agree with Ralph.
As it sits, it is only a shell. The Czechs used these
post-war for civil/fire duty, and it's likely that this
one was used for that purpose.
$100 would be about right, but I've seen some
silly pricing on post-war painted shells in
the recent past.........