Thats a tough decision, if you find a 60 year old filter do you dare put it on a good engine and have all the rotted Cotton fibers clog the rod bearings or the insect larve eggs plug the cam bearings??? Just hollow out your old filter and let the judges think it is real and then hide a modern FRESH canister filter underneath somewhere. Most guys feel the partial flow filters were almost worthless and you should just change your oil more frequently than the EPA tells you to. Stude8