Impossible to identify without a detailed description of all markings.
Possibly Herbert Schmidt
Inexpensive.
$75-100, depending on condition.
German or Italian. Most likely Italian
NO
Benjamin model EB22. Crosman model 2240. Benjamin Marauder Air or C02 Pistol. All 3 of these are .22 cal C02 air pistols, There are several others but they are spring or pneumatic not C02 systems
A pistol that fires .177 diameter pellets.
Yes.
My grandfather's pistol used in ww1
No it will jam in the barrel.
if a pistol, tnen the same way as the military 45 cal pistol
if it's a revolver......32 cal revolver ammo if it's a pistol......32 cal pistol ammo