one cronk pliers says cronk with a no 6
no two no markings looks like a hammer head shark with a permanent smile
The cronk pliers are likely made by the Cronk & Carrier Mfg co, Elmira,NY, aka Cronk Hanger co, child of William Cronk. They are more known for Button pliers, but made pliers in general. (1890's-?)
(They look like they are probably gas pliers, I can't see the end in the photo that well, is it hollow with teeth?)
the cronk pliers are hollow with teeth looking straight into the end of the jaws
the other looks like a electric coupling crimper except the bite has a smile not straight