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.
UPDATED:
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 ; Range 5.1-5.3
2) mk1 : up to 5.18 - 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.
Photos above from Geoff Isringhausen Jr
Mark 1
Photos above E. Delgado
Photos Vintage Concept
Mark 2 “The Rail Dial”
You can find more information on the rail dial here
Photos M. Pisani
Mark 3
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)
Photos from M. Pisani
Photos from E. Delgado
The Mark 4
Photos E. Delgado
Photos M. Pisani
The Caseback
Photo E. Delgado
