I have a 10 hp Johnson Seahorse I know very little about and am wondering if anybody can tell me the year and where I might find a manual for it (if that is even possible). The plate on the motor has the following information:<br /><br /> Model #: OD-15<br /> Serial #: 1177817<br /><br />I am also curious as to what this outboard might be worth as I am considering upgrading to a 15 hp in which case I would sell the Seahorse. The motor is in good shape considering the age and seems to run fine.<br /><br />Thanks for your help.