What year is this D4?

A 7U41032 is 1957---don't know what the other numbers mean and there shouldn't be a decimal point in the numbers--they are hard to read sometimes

Chan: Welcome to the forum.
That D4 would be a later model in the U series as mentioned above. A popular tractor back in the day. It’s always fun to see other folks tractors. Could you possibly post some pics of your FIL tractor(s)?
You may also share your location, as people tend to seek technical advice, parts or hands on help. JM

That C should be a D, I think, as D4 7U41032 and my book says 1958, 38715-42777. A late 58 model. catskinner

Welcome Chan. Please post photos - all four sides, operator's compartment, close-up of sprocket teeth and underside of tracks where the joints are, and the controls on the left side of the tractor just in front of the driver's compartment. That's a nice late model your father-in-law has

A 7U41032 is 1957---don't know what the other numbers mean and there shouldn't be a decimal point in the numbers--they are hard to read sometimes

That C should be a D, I think, as D4 7U41032 and my book says 1958, 38715-42777. A late 58 model. catskinner

Well, he guessed close. He thought it is a 59 or 60. Thank you for your help.

so can somebody else verify the year? I used Eric's listings.