Nicely done, Brian! Do you know what may have caused the lines of indentations behind the plate? It almost looks like somebody jammed a cockade or something in there... but probably not. These conversions are interesting. I have a Grenadier helmet that was converted to accept the new Garde style...
I'm sure somebody will get back to you with value. Please keep the chinscales joined at the front. Putting them under the helmet like that can break or severely damage them. Thanks!
I knew a fellow in Germany who had a personal Feuerwehr Museum, very nice collection. I bought a Prussian artillery NCO helmet from him. (It didn't fit in with his collection). Isselhorst, NRW, but it's closed now.
Theaters / prop companies can be treasures or tragedies as great artifacts are destroyed for productions. On the other hand, I DID get a mint condition US pre/early WWII Infantry Tanker (doughnut dome) tanker helmet that had been in an Australian theater's prop department.