Have a friend who bought what was listed as a 1965 Oliver 1800. The serial # is 157-753-427 That makes this a 1850 according to how the #s run , It has 1800 emblems on the hood. Any one know of other numbers other than Tractor House? Or /And how do We find the identifying numbers on the engine to see if we have a 283 or 310 . Yes this is a gas Tractor. Thanks !