This is a western model F10 from the Black Beauty series, it came in a set with the f10 " hatchet " and a model f66 knife.
It looks like there is / was a model number stamped onto the guard which would point to 1966-1973 era.
This is more of a hatchet shaped knife as far as I'm concerned, they also had the pattern 14 ( f14 in this case ) which was drop forged and had more of a hatchet profile instead of just being flat knife steel.