Bianchigirl has it pretty much right. The derailleurs are not worth a great deal - at the moment. My guess is, however, that because they are a bit ornate, with the stag's head embossed into the components, that one day they might be worth a dollar or two.
For my money, if I had any, I would give as much at $25.00 for a decent Stag's Head rear derailleur for my Tom Richey. I could use a set of thumb shifters, also and then the bike would be complete and original. Right down to the Richey slicks...
