Re Darren Laycock: Tod and Robert I planned to bring my old 2 passports to Immigration for my next one year extension of stay (retirement - deadline is Mar.1st, 2020) to prove that I never applied for a Non O A (to avoid the health insurance issue). But your answer to Darren Laycock taught me again, that I (even after nearly 17 years) don t know much on this system here in THA. My last Non O visa from 2005 (!!) is mentioned in my current passport as you described the relevant stamps to O/P Darren. Thanks for your always valuable advice.