Old Car Price Guide, OCPG, my restorer swears by it over Hagerty because it gives you value #'s 1 through 6. It comes out every 2 months. But in the 3 consecutive issues I have there have been no change in value for the cars in which I'm interested. Also it values my Falcon Sprint convertible as only 8% to 9% over the 2 door hardtop. Who said, "If the top goes down, the price goes up?"