135s came out in july 1964 at the Smithfield show, round fenders were fitted and red wheel centres. in late 1966/early67 the wheel centres changed to silver (except for the pavt)...In 1971 flat top fenders came out because that year a safety cab legislation was passed and it was deemed easier to fit safety cabs to flat top fenders, the reason that UH released this model with round tops is because MF restored a 135 to promote their 10+ parts range ( this tractor I believe is still in the Beauvais factory visitor centre), the tractor they restored is incorrect for the year in many ways including the mudguards and the seat type, but to add to the confusion 135s were made to 1979 for the export market with round type fenders, you could till order a 135 though through dealers and specify flat top fenders. There were 3 different types of flat top fenders, 1) early type with aluminium grab handles at front, 2) aluminium grab handles were replaced with a one piece fender with grab handles made as part of the mudguard and a toolbox with a one piece lid and 3) exactly the same as number 2 but the toolbox lid had a hinge to allow it to fold and this was because many aftermarket cab types limited the lid opening... 1964 to 1979 was a long production run and just over 252000 tractors were made, they were one of MFs best selling tractors of all time and had a heart like a lion and were built to last