No Expert here but the engine clearly displays a seven horse engine your side cover you say has 753. I am guessing what you have is in fact 1963 753 someone just got there 1964 on the hood wrong not to mention it shouldn’t even be in that location but a beautiful tractor! I am deep in tractors now, but if you was closer I would probably be bringing that one home! The steering wheel doesn’t look like an 854.. Hint 1964 which I don’t feel it this is! Also the gas tank isn’t a two piece like on a 1964. 😂. Hope I was some help! Others on here will know more and be able to know for sure!