Mainline imported them from the mid-70's until 1982. The great majority of them were 715 (3 speed, solid axle, 4-8 tires) and 725 (5 speed [3 speed transmission with second hi/lo lever down by the PTO], solid axle, 4-10 tires) tractors. Some were 735s (5 speed like the 725, locking differential with steering brakes, 5-10 tires).
If yours is a 735 it will be OK for mowing, but not great. The 735 only had 2 working speeds in "mower" mode - slow and slower. The 715 and 725 will be much less desirable while mowing with their solid axle. They will be very hard to manuever, AND the 715 only has one speed in "mower" mode - OMG are we EVER gonna get done!?!
Also, avoid the combo mower. It is not a good rig, no matter what you have for a tractor. It's ok for known areas where you're guaranteed to not hit a rock or stump. It WILL break your PTO if it hits said unmovable object.