Yep, looks like they started using flat head sheet metal screws
in '54 Greg. The two on the toe board were still a truss head
sheet metal screw. All were #14 I believe.
http://www.pbase.com/dennygraham/image/159810733/large
http://www.pbase.com/dennygraham/image/159810731/large

dg


Denny G
Sandwich, IL