Yes its hard to tell Gizmo...If your really keen,you can pop the front anxle housings off and check for groove wear on the base.
Other than this I would say its a STD Model 4 NON AUTO most likely somewhere in the range of the 130,000 and 200,000 serial,when it was sold.
Thanks again Gizmo for the images as this is the style of mower we are looking for from members,just with the serial number range previously Stated.
