Mine is in two places
The hull number/serial number (same thing I believe) on my H34 is molded in the transom up near the deck on the starboard side.The number is a composite of the size, maufacturer, consecutive hull number and manufacture date. It is also painted on the inside of the hull on the transom. You have to climb inside the locker where the batteries and fuel tank are located to see it. It is not underneath the mast. I looked there already.Allan