It's not a 2nd or 3rd gen (Sig Series). 2nd gens were all Baby Dragoons without loading lever, and Sig Series all had 4 1/2 inch barrels.
It looks like from the pictures that this is a 6 shot pistol. All the repros are 5 shot.
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