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The 1665 was launched in 1967 until 2008.
It was designed from the 5513 Submariner launched in 1953, adding a helium escape valve. Thus equipped, the Sea-Dweller now resists a depth of 610 meters instead of 200 meters for the 5513.
The production of the Double Red Sea Dweller stopped with the 52XXXXX serial numbers.
Since then, a new watch bearing the model number 1665 was born. The new watch had the same case as the 1665, but the dial was now devoid of red paint and new fonts were used and the case back was also different. The new "Great White" Sea Dweller was born.
The one for sale today is a Mark III model (serial numbers from 60XXXXX to 68XXXXX.
The indication at the bottom of the indicates that the dial is original.
At that time, ROLEX used Tritium on indexes and hands that emitted less than 25 mCi. The Curie (Ci) is the old unit of radioactivity. It was named in honor of Pierre CURIE.
The Sea-Dweller remains one of the most sought-after models of collectors.
After the 1665, the 5514 will be released, reserved for the professionals of the COMEX.