Kessy, I will presume you have already answered the question that "this" is the tractor that will do the things you want it to do around your place. Basic chores, such as grading, moving snow, moving dirt etc....Naturally, it is a 43 year old tractor, somewhat basic and gasoline driven, however with care, some maintenance, $$$ etc., will probably go another 43 years...
If the question then is only "price" or "is this a fair value". You can go to
Iron Search , and see about 8 or so for sale, most with images.. prices range from $3200-$5900 dollars, from pretty rough to reconditioned/ repainted... to search, click on tractors, put in model number, click on Massey-Ferguson. You can then judge the condition and price compared to these from around the country....
Again, if the question is however, is this the tractor for me ?... we will now start a long discussion thread based on alot of questions on what you plan to do....