If you place the presser foot in the down position and measure from the bottom of the foot to the screw hole where it attaches you will get either a 1-1/4 inch measure or a 3/4 inch measure. If it is the former, you have a high shank machine. If it is the latter, it is a low shank machine. The more modern machines can be either/or/slant which really gets confusing.
