Recently while rust hunting I encountered two of these (they followed me home)
Cast steel, 8 1/4 inches overall with a screwdriver end about 7/16 inches wide.
Handle is swelled, business end is 1 inch wide by 1 1/4 inches long. There is an
arc in the end, centered and 3/4 inch wide with a pin-1/8 inch in diameter in
the end.  Markings are a logo-a 1/4 inch circle with S over F, separated by two
v's pointing toward the center.  Also A-M-F and S-8.  I have googled AMF tool,
S-8, everything I could think of with no success.
I am hoping someone here can help me ID this tool.
Respectfully
Bill