I got this Davis Industries DM-22 derringer for cheap and it's real good shape. It fires good, I guess because it's the first time I've ever shot a Derringer. Is there a way to date this gun by the Serial Number? I know Cobra bought out Davis and I see the Cobra CM-22 my friend has is almost an identical gun but for the grips say Cimarron. I know it may not be worth anything or high quality but it's a pretty cool gun. I like it.