That's a nice Australian made one.
My vice is very similar. They're not exactly common here, the regular non-offset type are much more often seen. I can't imagine there are tons of Dawns in the States.
Red indicates it's cast iron (blue would be cast steel, green SG iron). The Dawn cast iron is pretty sturdy stuff.
I could tell you what they're worth over here but that probably wouldn't help you much! Replacement parts have been available for all the Dawns I have had to replace bits and pieces on so there's that in it's favour.