A lot depends now on what is in the articles in the official log book which has the crew list, as mention there is an international agreements, but there are peculiarities with different national authorities, remember when the Gueese Line (the banana boats) where reflag to Norwegian flag, some were sacked within 6 months, one 1st mate with 35 years service got no redundancy payments because he had less than 6 months under the Norwegian flag. Also the Master does not sign the crew list as he is under a separate contract to the owners and has the most litigations job in the world, as he represents the owners and is responsible for every crew member and the vessel plus cargo.