WW2 German Gebirgsjäger Officer's visor worn by a Combat Dentist

A scarce private purchase Second World War German Third Reich Gebirgsjäger Officer's visor cap named to Kriegs Zahnarzt Dr. Hopp (Mountain Troops, Combat Dentist)
double Erel, constructed of doeskin wool with a bottle green centreband and three rows of green piping, with metal eagle and an embroidered wreath surrounding the cockade, the silver chinstrap held in place by a silver pebble button to either side, the interior with a celluloid sweat protection cover above the silver manufacturers stamp 'Ges Gesch EREL Sonderklass Standard', further inscribed in ink to a pape insert with the owner's details, champagne lined interior with a brown sweatbeand further stamped 'Erel Stirnschutz D.R.G.M D.R.P. angem', with signs of use to the interior