You didn't tell us if it leaked! I assume it did. What should be done depends on how much water got into it. If the crystal fogged, it might be sufficient to remove the movement and air dry it. However, if there was water sloshing around under the crystal, he needs a full service. At the very least, have it checked to find the source of the leak, and have it attended to. In future, he should show his 50 year old watch more respect!
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