1690030-46" sickle bar mower
The mower attaches to the front axle and uses the tractor's lift system to raise and lower the bar. The unit is driven from the center PTO cone clutch just as the rotary mowers are. It has open faced guards and includes a chain for holding the cutter bar in an upright transport position.
Source: Dealer Sales Information, 700 Series Tractors, date unknown, courtesy of Del Allen.