I just picked up a free boat someone was giving away. As far as I can tell it's a 15' 1968 Shel Lake boat. It came with a 65hp Merc on it. I can't find a serial number on this thing to save my life. Some information I have found out is that its a Kiekhaefer Mercury and it has Panther G with the numbers 834-3997 stamped on the side of the motor. On the underside of the top cover it says it's a 650 E that was written on there by someone that did service on it. I found 6 different numbers on it but none that seem to be a serial number. Is it hiding under something or where else can I look for it? Any help would be much appreciated as I'm new to boat motors but look forward to getting my hands dirty on this one. For the price I've paid so far I can't go wrong.