In the mid-1980s, the short-lived 600 series was released. This included the 675, 690, 690T, 695, 698 and 699. The reason behind poor sales figures was due to unattractive styling and poor ergonomics, with the cab sitting much higher than previous MF tractors. Although the cab did give excellent visibility and a flat floor, being high off the ground meant it was best suited to field operations instead of livestock work. The 600 series was one of the first tractors to offer the user an option to control where the hydraulic fluid should be pumped. By moving a switch situated near the floor of the cab, the user could block off flow to the rear hydraulics and link arms, concentrating the full force of the pump on the front loader if equipped. In the late 1980s, one of the greatest selling tractors of all time was released- the 300 series Massey Ferguson. Excellent power, simplicity of cab, high range of gears and components made the MF 300 series a success especially in Europe. The range included the MF 340, 350, 352, 355, 362, 365, 372, 375, 382, 383, 390, 390T, 393, 394, 395, 398, 399 and 399T (the most powerful and popular Massey Ferguson 399) with horsepower ranging from 45HP to 104HP. The 300 series was also offered with a choice of cab, Hi-Line or Lo-Line. The Hi-Line cab featured a flat floor whilst the Lo-Line cab had a hump in the middle for the transmission tunnel. Some 'original' examples of the lower horsepower 300-series have been known to fetch prices exceeding £20,000 because of their rarity.