Unfortunately, there's not really a collector's market for old tools like there is with stamps, coins, comic books, etc. I believe the only exception to this is old planes. There are a number of guys here who collect PlOmb tools, but the other brands are more hit and miss. You might want to contact your local Cornwell dealer and see if he knows of a collector of that brand, or he might be interested.
I USED to collect antique ratchets, but don't do so much anymore with the wife and kids taking up the majority of my tool money.
In short, if I were trying to sell that set, it's probably worth more as a functional tools set, then a collector's set and I would price it accordingly.