Most likely a ROHM
Most likely ROHM or RG.
Herbert Schmidt Company.
Could have been Erma, Rohm, RG, Sauer or any of a half dozen others.
Sorry- but that is not enough information to answer. Serial numbers are NOT unique to one maker. Post again with ALL information marked on the gun, and we will try to help.
I have one that was pre war, mint condition, fired only once, made by Heckler.. Richard
Exactly how is the pistol marked? 9mm browning serial number 72C44338
The caliber should be marked on the slide.
It should be marked as to where it was made.
50-250 or so
RG10 pistol-ROHM
Impossible to answer without a detailed description of all markings.
It will usually be marked somewhere on the barrel.