From inside (document excerpt):
FORM NO. 3320-549 /’ MODEL NO. 16576 – 0000001 & UP MODEL NO. 16776 – 0000001 & UP OPERATOR’S MANUAL ” ” 21 ” (0.53 ml HP & SP SIDE DISCHARGE FINGERTIP START A SAFETY INSTRUCTIONS BEFORE OPERATING 1. Read this manual carefully before operating the mower. Become familiar with the controls and proper ‘use of the mower. Never allow children to operate the mower or adults to operate it without proper instructions. 2. Keep everyone, especially children and pets, away from the area of operation. Thoroughly inspect area where mower will be used.
Remove sticks, stones, wire and debris. 3. Wear long pants and substantial shoes. Do not operate mower while wearing open sandals or when barefoot. 4. Check fuel level before starting engine. Do not fill fuel tank indoors, when the engine is running, or until engine cools for several minutes after running. Wipe up spilled gasoline before starting engine. 5. Keep all guards, shields and safety devices in place. Repair or replace defective or damaged parts. 6. Disengage self-propelled drive before starting engine. Engine and blade are designed to stop when control bar is released. Assure control and brake function before each use of mower. WHILE OPERATING 7. Do not run engine indoors. 8. Always maintain secure footing. Keep a firm grip on the handle and walk; never run. Never operate mower in wet grass. Mow only in daylight or in good artificial light. 9. Mow across the face of slopes, never up and down. Use extreme caution when changing direction on slopes. Do not mow excessively steep slopes. 10. Keep face, hands and feet away from the mower housing and cutter blade when the engine is running. Stay behind the handle until the engine stops and keep clear of discharge opening at all times. 11. During operation, grass deflector or complete bagging assembly must be installed on mower.