Fortis B-42 Diver Chronograph Alarm

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B-42 Diver Chronograph Alarm is a dive watch by Fortis.

This diver's chronograph in the series "B-42 Diver" is equipped with a self-winding movement and an alarm function.

The special series with blue silicone strap is limited to 100 pieces. Here the movement is chronometer certified and the scales of the totalisers are highlighted in color.


641.10.92 Si 05 with blue silicone strap, certified chronometer, limited to 100 pieces
641.10.92 L with black leather strap
641.10.92 M with brushed steel bracelet Professional
641.10.92 K with black rubber strap


Self-winding chronograph movement with integrated alarm function F2001-5 (basis Valjoux 7750), 28,800 A/h
Ref. 641.10.92: chronometer (COSC)
32 jewels
Precision regulation, Incabloc shock protection, Nivarox hairspring
Decorated movement and rotor parts
Power reserve 50 h


Stainless steel, brushed
Ø 42.0 mm, H 15 mm
Sapphire crystal with anti-glare treatment on both sides
Unidirectional rotating black bezel (120 lines screening) with 60 minutes scale
Steel caseback, screwed with mineral glass window
Individual numbering
Waterproof to 200 m


Blued and skeletonized hands
Indexes and hand tops with Superluminova


Hours, minutes, small seconds, date
Hacking seconds
Chrono function, alarm function
Colored triangles at 3 o'clock to illustrate the crown direction of rotation for quick setting of all functions


Rubber strap or reptile leather strap with tang-type buckle or stainless steel bracelet with folding clasp


2 years