Since you didn't say, let me guess, it's a 4 shot replica of a Sharps 4 barrel derringer, right? made during the late 50s untill 1968. EIG used several Italian firms plus even the Japanise made a copy. Brass frame, more than likely 22 short, however they may have made them in 22LR. No collectors value, to be honest not even a good self defence gun, it's not very accurate. Value, don't know, I've seen them at gun shows in very good shape for 50$. Hope that helps.