Check the 'MIC', if the boat is new enough to have one.
The WaterCraft Identification Number (WIN, previously CIN and HIN) is a 14-digit code that is marked on the boat in two places, one on the starboard side of the transom and a second hidden within the boat. The CIN is usually moulded or etched into the fabric
of the boat hull
to ensure permanency.
The WIN consists of a two-letter code to denote country of origin (boats built in the UK use GB), followed by a three-letter code to denote the manufacturer. This code is known as the Manufacturer’s Identity Code (MIC) and is unique to the boatbuilder.
In the UK the register of MIC is maintained by British Marine
on behalf of the Department for Business Energy and Industrial Strategy (BEIS).