If he lived at a border town, he might have got a restricted passport which allowed him to move only between Thailand and his own country at the nearest border checkpoint. Such restricted travelling documents are exactly that - a single piece of paper which is stamped each time he crossed the border. It would probably have a shelf life of no more than either three or six months but would be easily renewable many times for a similar period. We used to have them for Malaysia/Thailand travel but ours were only valid up to Hatyai and not if you went further north than that, not even to Phuket, but most people ignored the restriction since no official on either side of the body ever checked.

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Urepentantly irrascible old fart!

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