An overlay is identified by the door sitting outside the frame (fig 34).
If you look at the furniture side profile, the door will be visible. Another factor in the overlay door is how much the door actually “overlay’s” the face frame. If you are having a custom piece of Amish furniture made this measurement is important to the Amish Craftsman.
Take a tape measure and get the distance both horizontally and vertically inside the face frame. Determine how much bigger the door is than the face frame and divide by 2, that is the amount of overlay on each side.