Is it brass framed or color case hardened frame with brass backstrap & triggerguard? Round barrel or octagonal barrel? Creeping loading lever or hinged loading lever? As Aguila Blanca said, pictures would help immensely.
It sounds like its an 1860 Army revolver; but pictures, would nail it down.
Fingers (Show Me MO smoke) McGee - AKA Man of Many Colts - Alter ego of Diabolical Ken; SASS Regulator 28564-L-TG; Rangemaster and stage writer extraordinaire; Frontiersman, Pistoleer, NRA Endowment Life, NMLRA, SAF, CCRKBA, STORM 327, SV115; Charter member, Central Ozarks Western Shooters
Cynic: A blackguard whose faulty vision see things as they are, not as they should be. Ambrose Bierce