Which international ship certificate has indefinite validity, subject to its conditions of issue continuing to be complied with?

The International Tonnage Certificate (1969). It must be replaced by a new certificate, however, if any characteristics of the ship, such as the total volume, volume of cargo spaces, moulded draught or number of passengers, are altered such that the ship’s net tonnage changes.

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Apart from an International Tonnage Certificate, what other tonnage certificates might a UK ship trading worldwide carry?

How was net tonnage determined in the UK before ratification of the International Tonnage Convention, 1969?