The "Great White” Sea-Dweller Model 1665

by M. Pisani and E. Delgado


The Double Red Sea Dweller eventually production stopped around the 5.2 million serial and since then a new watch that retained the model number 1665 was born. The new watch had the same case as the 1665 but the dial was now devoid of the red paint and new fonts were used and the caseback was also different. The new “Great White” Sea Dweller was born. 


1665 white

jatucka (roberto)         


From M. Pisani

1) mk0 : very few ( at random ) on earliest watches with " circular back engravings " ( and no case number engraved in back-inside ) ; earliest seen have case number in the 5.0 range ;
2) mk1 : up to 6.1 - 6.2
3) mk2 ( rail ) : in the 5.7 - 6.2 range
3) mk3 : in the 6.0 - 6.8 range ( roughly )
4) mk4 : from 6.8 up to production end ( roughly )


The Dial

Mark 0

By far the rarest of the great whites.

mark01665white sdbooklet


Photos above from Geoff Isringhausen Jr


Mark 1

mark1sddialcloseupD2x2209
wsdmark1D2x2220

Photos above E. Delgado


mark3wsdvintageconcept61mi

Photos Vintage Concept



Mark 2 “The Rail Dial”


You can find more information on the rail dial here

mark2wsdraildialrimg05342 med
mark2rail1665pisani3 med

Photos M. Pisani



Mark 3

mark31665bernhard

Photo Bernhard


M. Pisani noted on the mark 3 vs the mark 4.

Very small differences between the mark 3 and 4 
1) different position of the 2nd " S " in the word " SWISS " vs. the 31th index of the minute track ;
2) different shape of the number " 6 " in " 610 ";
3) different sloping of the letter " f " in the abbreviation " ft " ;
4) the last letter " R " in the word " CHRONOMETER " looks shorter in mk4 dials.


Another way to tell a Mk 3 from a mk 4 is the position of the R under the 2 in the SCOC TEXT.  (form J. Field)

comp1665-mk3-beyerledet1 zpse980d3c8
comp1665-mk3-beyerledet2 zpse1bb2b60

Photos from M. Pisani


fullmark3sdwbp03222013-135752

Photos from E. Delgado




The Mark 4

mark3wsdD2x3171
mark3wsdD2x3159

Photos E. Delgado


comp1665-mk4-det zpsff79c804

Photos M. Pisani



The Caseback

D2x3161

Photo E. Delgado




D2x3168
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