Rob,
I am pretty sure that the item in the middle of the top row (with different size holes and split down the middle with two clamp screws on either end) is a relatively modern tool for swaging a flare on tubing for use with the appropriate nuts and fittings (like AN or JIC or refrigeration fittings). The tubing end is clamped in the appropriate size hole with the end protruding a little. Then a conical swage, which I don't see in the group, clamps around the split clamp above the tube end and is driven by a screw down against the end of the tube to flare it. I think that one got mixed in somewhere along the way but is not really an old gunsmithing tool.
Dave C