Cast iron Patent plaque on dash has May 23, 1922 as its last patent, so it is at least a 1922. Number on block is 1535 with a number 9 under it. It has petcocks for engine oil level, not a dipstick. It has a AT4 American Bosch mag 1CFD. There is a groove in rear axle housings for fenders which I read meant 1920 or later. There were two tractors on the property, and I am sure parts were swapped. Are the rear wheels stock? I have another set of heavy lug steel wheels that came with, but requires fender removal. I also have three fuel tanks. One Detroit, one England , and one junk. The England is dual fuel. I would like to install the proper tank. These tractors were located in California, so a English model is a stretch? Or not?