HeelSpur,
Here is the Goodell-Pratt hand vise. The two crossed pieces between the handles keep the jaws parallel. As an aside, G-P also made the same vise with a loop at the end of the handle for use by linemen. Wouldn't do to drop one of these on your buddies head. You might not get off the pole. :) I have never seen one with the ring other than in the catalog.
The length is 4 7/8 in. with jaws that are 1 3/16 in. wide.
Mike