Longines Nautilus Skin Diver 6921-2 (1960) [ID15000]
Longines Nautilus Skin Diver 6921-2 (1960)
**Longines' first dive watch**
Pre-owned Longines Skin Diver Ref. 6921-2 (Longines' first dive watch), with a 40mm stainless steel case that maintains its sharp edges and is presented unpolished, original bidirectional rotatable black Bakelite bezel with graduated in 15-minute interval (cracked between 6 and 7 o'clock and the white filling of the triangle at 12 o'clock is missing). Original black lacquered dial with baton hour markers and Arabic numerals 3, 6, 9, and 12 and hands filled with luminescent material (Radium). Original Plexiglass crystal and solid steel case back engraved with a diver with a harpoon. Automatic manufacture movement calibre 19AS. Black rubber strap with steel tang buckle.
A very rare timepiece. In perfect working condition. Maintains unpolished case shapes. Watch with the extract from the Archives.
Read more about this watch...
Longines' first dive watch was the Nautilus Skin Diver Ref. 6921, a 40mm stainless steel model with an external rotating bezel.
Essentially, skin diving is snorkeling. So when you go skin diving, you only wear flippers and a mask/ snorkel, plus a watch, of course. With the rise in popularity of diving in 1950s, we saw the introduction of the so-called skin divers. These watches were lightweight diving watches that often used the same case and had a lower depth rating.
The Nautilus Skin Diver Ref. 6921 was only produced for a couple of years at the end of the 1950s, and it's estimated that only 550 examples were even produced across 3 references: 6921-1, 6921-2, and 6921-3. The 3 sub-references simply represent separate production runs: the dials are the same, with the Longines logo at 12 o'clock and "Automatic" script at 6 o'clock. The hour hand features a broad arrow with subtantial lume, with the thinner minute hand and also filled with lume to facilitate easy legibility.
Inside ticks Longines' 19AS automatic calibre, a 19 jewels movement that beats a low 18.000 BPH and with 39-hour power resistance, but with a unice construction. There's perlage finishing around the caliber's perimeter, with the automatic rotor taking up a relatively large amount of space, while the movement itself sits smaller in diameter and thicker. First introduced in 1952, it was used in a number of Longines models and produced in multiple variations.
The case was manufactured by Ervin Piquerez, S.A. (EPSA), and features the company's famous patented case-sealing "Compressor" technology that improves water resistance. The Ref. 6921 was rated to 150 meters of water resistance and is one of very few models with a single crown.
The external bezel was made of a fragile Bakelite (that's why on our exampe it's cracked between 6 and 7 o'clock).
One of the nice details of the Nautilus Skin Diver is the case back, which features an engraving of a diver with a harpoon.
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