Reference:1665: Difference between revisions

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===Double Red Sea-Dweller, Mk IV===
===Double Red Sea-Dweller, Mk IV===


The most common DRSD. Closed sixes in the depth rating ("610"), dot-matrix print visible under magnification, prominent coronet with a defined "O" interior. The Mk IV runs from c. 1971 through 1977 and is the dial most collectors see when they think of a DRSD. Some catalogue traditions (notably drsd.com) extend the taxonomy to Mk V, Mk VI, and Mk VII; the Bob's / Fratello / Perezcope canon stops at Mk IV.
The most common DRSD. Closed sixes in the depth rating ("610"), dot-matrix print visible under magnification, prominent coronet with a defined "O" interior. The Mk IV runs from c. 1971 through 1977 and is the dial most collectors see when they think of a DRSD. Some catalogue traditions (notably drsd.com) extend the taxonomy to Mk V, Mk VI, and Mk VII; the mainstream Fratello and Perezcope taxonomy stops at Mk IV.


===Great White, Mk 0 "Big White"===
===Great White, Mk 0 "Big White"===