My Dad recently got a Johnson Seahorse, Model #TD20, Serial Number 597510 and we think it is a 3 or 3.5 horse. It's in great shape, starts on the first pull,idles down to almost nothing and hasn't been running for over 20 years. The owner who gave the motor to my Dad thought it was a 1970 model. Can anyone help me find the year of this motor and if it worth anything? Dad might be interested in selling.<br />Chadwick
