1936 floorboard screws

[FrankWest]

The flat head screws for the floor sound right enough because flat is what a floor should be. I had a mixture of flat and oval head on my floor. There is one interesting detail on the extreme right lower screw hole. There is one FLAT head screw that is permanently rusted in place. Perhaps this one is an original factory installed, that could never be removed As the two prestigious gentleman stated...Makes good sense to use flat head screw on the floor.