Grenchen, Switzerland

Fortis

Swiss brand founded in 1912 in Grenchen, known for its pilot watches and the chronographs it sent into space.

In Horlobase, Fortis cases run from 39 to 44 mm across, half of them between 40 and 42 mm. The thinnest is the Marinemaster M-40 (12 mm), the thickest the Flieger F-43 Triple-GMT (15.5 mm).

www.fortis-swiss.com

Coverage so far

12 of 12 references have at least one lug-to-lug figure; the brand itself publishes one for 12.

Fortis references

Watch	Ø	Thickness	Lug-to-lug	Calibre
Flieger F-39 F4220005	39 mm	12.5 mm	50 mm	UW-30
Flieger F-41 F4220008	41 mm	12.5 mm	52 mm	UW-30
Flieger F-39 Werk 7 F4220028	39 mm	12.5 mm	50 mm	Werk 7
Flieger F-41 Werk 7 F4220030	41 mm	12.5 mm	52 mm	Werk 7
Flieger F-43 Bicompax F4240004	43 mm	15.5 mm	54 mm	UW-51
Flieger F-43 Triple-GMT F4260000	43 mm	15.5 mm	54 mm	Werk 13
Marinemaster M-44 F8120013	44 mm	14 mm	48 mm	Werk 11
Marinemaster M-40 F8120024	40 mm	12 mm	43 mm	UW-30
Novonaut N-42 F2040008	42 mm	15 mm	51 mm	Werk 17
Novonaut N-42 TR F2040021	42 mm	15 mm	51 mm	Werk 17 TR
Stratoliner S-41 F2340006	41 mm	14.5 mm	50.5 mm	Werk 17
Vagabond V-40 F6660000	40 mm	13.9 mm	46.5 mm	Werk 13

Calibres used by Fortis

Calibre	Power reserve	Frequency	Used in
UW-30	38 h	—	3

About Fortis

Walter Vogt founded Fortis in Grenchen in 1912 and in 1926 sold one of the first automatic wristwatches, with John Harwood's system. Its chronographs later equipped cosmonauts, notably on the Mir space station.

The brand makes pilot's and diving watches, now with its own Werk calibres.