Artikel 10

If a ship belonging to a country to which this Convention applies, has been measured in accordance with the principles laid down in the Annex to this Convention (generally known as the English system), before the Convention has come into force in the country concerned, the certificate showing the tonnage based on such a measurement, and issued in the country to which the ship belongs, shall entitle to the same privileges as an International Tonnage Certificate.
If the ship, after the issue of such a Certificate, has been altered as mentioned in Article 6 of this Convention, the ship shall be provided with an International Tonnage Certificate after having been remeasured to the extent considered necessary.