Alpina Seastrong Diver Extreme Automatic Watch with Blue Dial.
The Seastrong collection gathers the Alpina dive watches, each set with a ceramic bezel and luminescent hands. In the Seastrong Diver Extreme Automatic, the Extreme cushion case comes to the Seastrong collection for the first time, 40.5 mm long under a unidirectional notched ceramic bezel. In stainless steel, it measures 39 mm across and 12.65 mm thick.
An AL-525 automatic movement powers the hours, minutes, seconds and a date at 6 o’clock beneath an anti-reflective sapphire crystal.
The dial, in navy blue evoking the depth of the ocean, is worked in the triangle pattern that marks Alpina, inside a matching outer ring, and silver indexes and the hands carry white luminescent treatment. It comes on an integrated navy blue rubber strap measuring 16 mm at the lugs, closed by a push-button folding clasp.
Diving. Seastrong brings together the dive watches of Alpina, built around ceramic diving bezels and luminescent hands. Gottlieb Hauser founded Alpina in 1883, and the brand produces and assembles its movements and watches at its manufacture in Plan-les-Ouates, Geneva.
At the start of the dive, align the zero of the bezel with the minute hand. The minute hand then reads the elapsed minutes off the scale, and because the bezel turns only counterclockwise, a knock can only shorten the dive time it shows.
A full wind delivers about a 38-hour power reserve. Daily wear keeps the mainspring topped up, and after a longer rest in a drawer a few turns of the crown restart it.
Alpina builds the AL-525 on a Swiss Sellita SW200 automatic base, and assembles its watches at its manufacture in Plan-les-Ouates, Geneva, as part of the Frederique Constant group.
Sapphire sits at 9 on the Mohs scale, just below diamond, so few things encountered in normal wear will mark it, and the anti-reflective treatment keeps the dial readable at an angle in bright light.
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