Perhaps you have an older version of the I&T manual??? My I&T Manual does show the oil filter and pan views, as well as the '39-'53 MPC too; both with the part numbers, descriptions, and exploded views. Yours does look like a ho-made gasket like Dollar Bill said, some composite/fiber type. What is the ID of it? What is the OD size? We can't judge by the pictures. You need a scale reference so we can identify it. The oil pan plug gasket is p/n 8N-6734, cork, on the oil pan drain plug. There is a small fiber washer/gasket that goes beneath the oil filter canister lid clamp bolt. It is original part number 01A-6749, see pictures - still sold at CNH. That is sort of what your find looks like but how it got from the oil filter housing all the way to the oil pan is highly unlikely. Again, what is the size of the ID and OD? The oil pan plug, p/n 9N-6730, has a fine mesh screen attached to it that when the plug is fastened, the oil pump pickup tube fits inside it.
FORD OIL FILTER CANISTER CAP GASKET -01A6749: