The model information is not sufficient to accurately determine the year of manufacture for your Chrysler 6 hp outboard motor model 62HD serial 6665. You will need to provide additional information, such as the manufacture code, which can typically be found stamped on a metal tag attached to the motor. The manufacture code will consist of a letter followed by a series of numbers.
This information can be found in the owner's manual for the motor, or you may be able to contact a Chrysler marine dealer or service centre for assistance.