Up for auction: 

ENGINE REBUILDING KIT

Ford, Mercury V8 1949 - 53

Big Bore - Copper Head Gaskets 

Ford, Mercury V8 1949 1950 1951 1952 1953

The box is still factory sealed so the gaskets have not been out.  I found this in a box of items bought at a real estate sale so I don't know much more about of them.  Part number on the end of the box is RS 521 CB.

BESTgasket .... sealing history!