For the Benefit of Eveyone!
33CFR181.29 Hull ID numbers started in 1972.
On boats built after 1 August 1984 two identical hull numbers are required on each boat.
Primary number on boats with transoms, starboard side within 2 inches of the top.
The duplicate must be affixed in an unexposed location. It will be hidden so a thief cannot find it and remove both of them if the boat is ever stolen. It may be under a cleat or a fitting. Law enforcement needs to be aware of this requirement, so they can trace a stolen boat. The manufacturer can be contacted for the hidden location.