the standard answer to the old car "what's it worth?" question is that its worth what someone is willing to pay...I'd love a 55 or 56 Merc cause we had one when I was kid in jr and sr high and remember learning to drive in it.
you might try the HAMB forum... probably get some bites there;
why not just keep it, restore and enjoy it?
just my 2 pesos worth!
Mark