Hi James,
I think you are asking about a 1986-89 offered 210cc Sailpower. The serial number was factory placed on the starboard side of the swivel bracket on likely a decal. A matching cylinder block serial number I think is on the starboard side (of the cylinder block – ? on a casting plug). They were basically a 20" or 25" Merc 9.9 horsepower with factory installed battery charging coil and rectifier, and a low pitch propeller suited for use on a sailboat. I seldom login here, so if you should send me a private message, do write a note here so that I will know to check.
Regards,
Joe