The Mercury 80 hp seems like it would be around 1967 based on this chart:<br /> http://www.boatmotors.com/cgi-bin/motorparts/help.cgi?help=year&manufacturer=mercury <br /><br />Since you gave a s/n for the boat, I'm assuming that it doesn't have a 12 character hull ID. If it doesn't have one on the stern then it may be a pre 1971 boat...just a guess - that may be incorrect.
