From inside (document excerpt):
Lawn Mower 22, Recycler) Form No. 3352-550 Rev A Model No. 20005–Serial No. 250000001 and Up Operator’s Manual Introduction Read this manual carefully to learn how to operate and maintain your product properly and to avoid injury and product damage. You are responsible for operating the product properly and safely. You may contact Toro directly at www.Toro.com for product and accessory information, help finding a dealer, or to register your product. Whenever you need service, genuine Toro parts, or additional information, contact an Authorized Service Dealer or Toro Customer Service and have the model and serial numbers of your product ready.
The illustration below identifies the location of the model and serial numbers on the product. Write the numbers in the space provided below: Model #: Serial #: m-5607 Important: This engine is not equipped with a spark arrester muffler. It is a violation of California Public Resource Code Section 4442 to use or operate this engine on any forest-covered, brush-covered or grass-covered land. Other states or federal areas may have similar laws. This spark ignition system complies with Canadian ICES-002. The enclosed Engine Owner’s Manual is supplied for information regarding The U.S. Environmental Protection Agency (EPA) and the California Emission Control Regulation of emission systems, maintenance and warranty. Replacements may be ordered through the engine manufacturer. The engine manufacturer has specified the rated engine gross horsepower based on SAE standards/procedures (J1940 and J1995). As configured to meet safety, emission, and operating requirements, the actual engine horsepower on this class of lawn mower will be significantly lower. Do not tamper with the engine controls or alter the governor speed; doing so may create an unsafe condition resulting in personal injury. This manual identifies potential hazards and has safety messages identified by the following words: ยท Danger signals an extreme hazard that will cause serious injury or death if you do not follow the recommended precautions. Warning signals a hazard that may cause serious injury or death if you do not follow the recommended precautions.