ORIGINAL: mauser06

my dads friend gave him a percussion cap single shot pistol a looooong time ago....he gave it to me to put on a shelf i keep all kinds of hunting memories ect..and its been there since....neither of us muzzleloaded at the time...now i do..i flintlock....the gun has no markings at all...single shot full wood about a foot long and its a percussion cap...i just dont know what caliber...not 50...