This is a new old stock auto part. NOS gm in old original gm box. This is a vented gas cap has S stamped in center rivet and says anti serge and vented on cap. GM part # 3814436
listed as fitting
- 1949,1950,1951,1952 chevrolet passenger car
- 1953,1954,1955,1956,1957,1958,1959,1960,1961,1962 corvette all models except 24 gal tank
- 1958,1959,1960,1961,1962,1963 chevrolet impala , belair, biscayne and other full size models