I have a couple of these - and haven't been able to find out anything other than what TJ posted. Seem to be nice quality user type knives - they are commonly listed on e-bay, and seem to go for roughly $15 to $40.
I also saw this listing for a Bingham Knife - looks to be the spitting image of the Voos / New Haven Hdwe knife - listed for $90, although they don't have any takers as yet:
http://cgi.ebay.com/Bingham-Pocker-Knif ... 2307feb0e8
I am assuming New Haven Hdwe made the knives on contract for Bingham? but that is just a guess.
Unk