If they are lightly used and not too excessively dry rotted, I would say they are worth about $25-$40 each. Honestly, I value them the same as any other used pre war tire. Other opinions may vary.
that's just what's hanging in the basement, there's a pile in the bike shed too! New England is pretty tough on the old bikes, most of the time tires end up being junk but every now and then something turns up that is worth saving.
I was fortunate to pick up a 40's elgin over the summer with a pair of nearly new Schwinn Typhoon cord tires on it. they still had the "nubs" on the as they say. not being a schwinn guy I sent them off.