Well, it is at least 38 years old. There weren't a lot of them made. Two whel drive only. Old IH's make a ton of power with great lugging power, but will use fuel. Diesels are a little difficult to start in cold weather. I love the old IH's and this is a decent model although not highly sought after by collectors and tractor nuts unlike a 656 or 666.
What kind of condition is it in at this point?
What do you plan to do with it?
If it meets your needs and you think that you can handle the maintenance, then it may be the perfect tractor for you...