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There are many vintage dive watches that are referred to as “Monnin case” watches. Watches from TAG Heuer/Heuer, Chronosport, Zenith, Aquadive, Zodiac, Felca and many others are claimed to have Monnin cases. The thing is, these watch cases are made by a company called M.R.P., not Monnin. Open the back of these watches and look. I have owned several Heuers, TAG Heuers and a Zenith and they all were marked “M.R.P.”. They also say “Brevet 503.305”. Brevet of course means “patent” in…
