Right Hand Props so they are not Mercury. Possibly Michigan Wheel aftermarket.
Louis
Follow up question,,, Do they seem to be for low power low speed outboards? Pat Pend seems to imply they are possibly pre WW2 or even , Bore size might narrow field of possible applications, Columbia , Michigan Wheel catalogs may give answer, It is possible to look up patent number on line if either prop is so marked. Information on props not 100% clear in photos, Could you transcrive and post?