15hp 3415 Sovereign
Hydrostatic Drive / 4-speed Shuttling Drive
Simplicity Sovereign has two transmission options. More horsepower than ever before. Powerful enough to handle anything you can hand out. Trims grass with a 42" or 48" rotary mower. Gets together with many other attachments to keep working for you all year 'round. Comes equipped with dual lights.
Simplicity Landlord ® with three drive options and 10 hardworking horses, clips 42" at a pass . . . up to 2 acres per hour.
10hp Landlord 3410
Hydrostatic Drive / 4-speed Shuttling Drive / 3-Speed Gear Drive
Both offer an optional electric powerlift to let you raise, lower and hold attachments with the touch of a lever. Traction control transfers some power to the wheel with the best footing. Gives you complete control while turning. Won't scuff your newly trimmed lawn. Touch-O-Matic clutching on all models gives you foot controlled inching, so you can keep both hands on the wheel. Synchro-balanced Briggs & Stratton engine on Sovereign reduces vibration. Electric key starting.
[Source: Simplicity brochure, 15hp and 10hp tractors, Form 11-007, hand-dated 7/24/72, courtesy of Wally Koerbel]