Re: Michigan propeller help. Where to find info???
Those are serial (lot) numbers, not propeller model numbers.
The SMC # is not a Mi Wheel Marine serial #
The J25 appears to be a Hall & Stavert serial #. Made in Prince Edward Island, Canada. It is probably a Hy-Torq design.
H&S is now closed and all manufacturing there has been moved to the Michigan Wheel plant in Grand Rapids Michigan.
The actual part #'s for Mi Wheel propellers are at least 6 digits.
i.e. Part # 350125 is a 17" diameter, Left Hand rotation,21 pitch, Bronze, Michigan Dyna Quad style, 4 blade, with 1.25" standard taper keyway.
Need more info to help you out.