2 ms·

I would bet it did. Here’s an F-91W hydro modded with olive oil taken to 3000 feet. https://forum.tz-uk.com/showthread.php?330958-The-Little-Watch-That-Could h

• synthmeat 7y ago
  I was just reading yesterday about another case too - https://forums.watchuseek.com/f2/my-oiled-casio-f-91-dives-deeper-than-40-meters-several-times-many-underwater-photos-3692106.html https://forums.watchuseek.com/f2/my-oiled-casio-f-91-dives-d...
  • akavel 7y ago
    He seems to mention purposefully creating an air bubble in the enclosure (by letting a few drops of the oil drip out) — why would he want to do that?? > "I slightly loosen two screws, to let out a couple of drops of oil (which would allow forming a bubble inside the box)."
    • TheSpiceIsLife 7y ago
      If the oil expands and contracts with temperature then the bubble would allow this without the oil blowing the seal. I think that’s the idea. Could be wrong.