HI guys, newbie here to forum & to boating . just bought a boat & out board motor . the guy i bought it from didn't know what type of boat it was or if it even ran . it was his fathers who recently died & just wanted to get rid of it . i picked it up for $100.00 . it's a 20' fiberglass boat with wind shield & steering wheel he told me he thought it was a 1970 wasn't sure what make . It's got a mercury 500 50 hp 4 cylinder motor . serial # 1519547 i assume thats the serial # it's stamped into the block on top of the motor there's no tag on the motor anywhere. my question is can anyone tell mr what year the motor is so i can pick up a maint. manual . i checked that swiss site but couldn't find my serial # it only went back to 1965 . it looks exactly like a 1970 i seen on ebay but i just don't know . well any way igot the motor running . just had to clean up yhe ignition system new wires, plugs, clean up the points &coil connections . it runs great i hope it runs this good when i get it in the water . sorry for the long post . and hope you can help .