A 5-mm-thick mineral crystal also contributed to this watch’s enormous pressure resistance
A 5-mm-thick mineral crystal also contributed to this watch’s enormous pressure resistance When the watch returns with the diver to the surface, there is a risk that the helium, which expands as pressure decreases, will cause the crystal to burst off the case. Rolex was experimenting with a helium-release valve at this time, but Omega took a different approach and built the PloProf with a case so tightly sealed that helium atoms couldn’t even get inside. For testing, Omega installed the replica watches industry’s only mass spectrometer in its development laboratory. The Swiss replica Omega Seamaster 600 watches was very popular and is now a sought-after collectors’ watch. Automatic Caliber 1002 had a date display. The orange minute hand was particularly large because this indicator provides the most important information under water. The dials were navy blue or black. The crown was moved to the left side of the case to make room for the safety pusher of the rotating bezel....