HELP! Any info and price range. I just inherited a German single shot .22 cal. pistol. Break open, double triggers,front & rear adj. sights, 11" barrel, blued with wood target style one piece grip. Proof marks on left side of barrel are crown over B and crown over G. Right side of receiver is stamped same. The barrel is octagon from the muzzle 1-1/2" back and then "fluted" for the next 5-1/2". The balance of the barrel has a milled flat on top in front of the rear sight.The receiver has a fired indicator pin on top and a stippled and engraved top tang. There is some engraving on both sides of the receiver as well as the trigger guard. The left side receiver has D.R.G.M. stamped inside an engraved wreath. This thing even came with a leather front sight cover. I have owned a few different firearms in the last 40 years but this is the first one of these I have seen. Any help would be appreciated. Thank You in advance. AJ