Look at the motor mount on your Force outboard motor. The serial and model numbers are on a placard placed next on the transom bracket of the motor. Look for a state registration decal, as well. Six states require an engine to registered separately: South Carolina, Missouri, Ohio, Oklahoma, Texas and Utah. The date of manufacture is required for the registration process. If your Force motor has such a decal, you can contact the state and use the registration number on the engine to obtain a copy of the expired registration, which will tell you the age of the engine. here