Hi, I processed the left side of the revolver quickly in Adobe, and wow, this should help the OP and others ID this revolver/precious family heirloom.

As others mention, separate the holster from the revolver to protect the revolver but don't toss it. The holster helps bring it all together, IMHO.

Oh, and don't soak the original wood stocks (grips) with the revolver . . . just the revolver.

Congratulations and keep us informed as you go forward. It is no telling what you (and the rest of us) might glean from the expertise of the collectors here!

Welcome to the forum! Tom