Being the first one built in 1937 makes it a bit more interesting...might add to the "value" if you want to sell it but probably not much.
Dan, unfortunatly you don't have a rare tractor that would bring a whole lot of money if sold but that has little to do with it's "value"...at least in my book. My comments are assuming your relationship with your father was a positive one and my apologies if it was not.
Why don't you keep the tractor and restore it as a tribute to your father? You could'nt pick a better tractor than that WC if you've never restored a tractor. As basic as it gets and you can usually find parts pretty easily. There are manuals and even videos available to help you along... Not to mention the vast pool of knowledge made available by the good people who frequent this website. I feel confident in saying that whatever question you might have...no matter how seemingly "dumb"...someone on this site will help you with your problem.
If you have children...restoring a tractor can be a great family bonding project...especially if it was your Dad's. Even running for parts can be a fun expierence if you let be. You don't need many tools and if you louse somethig up...like the paint job...WHO CARES!!!? It's still a pretty good snow plow!