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Fortis · Marinemaster

Fortis Marinemaster M-44

Reference F8120013 · Dive · 44 mm

102030405014Ø 44 mmLug-to-lug 48 mm
Illustration drawn from the specifications: case to scale, colours and style approximate. Not a photo. Photos on the official page

Specifications

Reference
F8120013
Family
Marinemaster
Category
Dive
Status
Current
Case material
Stainless steel
Case diameter
44 mm
Case thickness
14 mm Official
Lug-to-lug
48 mm Official
Lug width
—
Water resistance
500 m
Bezel
Rotating, diver
Calibre
Werk 11 Official
Power reserve
70 h

Official product page · retrieved October 25, 2026

Does it fit your wrist?

Enter your wrist circumference. The watch appears to scale on the flat top of the wrist.

102030405014Lug-to-lug 48 mmFlat top of the wrist 54.1 mm
Top view on a wrist, to scale
Flat top of the wrist 54.1 mmLug-to-lug 48 mmCase diameter 44 mm
Side view, across the wrist

Comfortable

Lug-to-lug 48 mm on a flat top of 54.1 mm: 89 % of the width.

Lug-to-lug is 75 to 95% of the flat top, the usual comfortable range.

Measurements and sources

Brands rarely publish thickness, lug width and lug-to-lug together. Each observation below is kept separate, with who gave it.

Case thickness

Value Type Source Date
14 mm Official Fortis October 25, 2026

Lug-to-lug

Value Type Source Date
48 mm Official Fortis October 25, 2026

Lug width

Lug width is the gap between the lugs, where the strap fits. It is not lug-to-lug.

No source gave this figure yet.

Calibre source

Official Fortis · retrieved October 25, 2026

Other versions in the same case

These references differ only by dial, bracelet or bezel colour. The brand gives them the same case dimensions, so the figures on this page apply to them too.

  • F8120019 · Woodpecker Green / Horizon Strap
  • F8120017 · Black Resin / Horizon Strap
  • F8120015 · Black Resin Gold / Horizon Strap
  • F8120021 · Ocean Blue / Horizon Strap
  • F8120031 · DLC
  • F8120030 · Gravity Black

Other Marinemaster references

Watch Ø Thickness Lug-to-lug Calibre
Marinemaster M-40 F8120024 40 mm 12 mm 43 mm UW-30

Other Fortis models

Watch Ø Thickness Lug-to-lug Calibre
Flieger F-43 Triple-GMT F4260000 43 mm 15.5 mm 54 mm Werk 13
Flieger F-41 F4220008 41 mm 12.5 mm 52 mm UW-30
Flieger F-41 Werk 7 F4220030 41 mm 12.5 mm 52 mm Werk 7
Vagabond V-40 F6660000 40 mm 13.9 mm 46.5 mm Werk 13
Flieger F-39 F4220005 39 mm 12.5 mm 50 mm UW-30
Flieger F-39 Werk 7 F4220028 39 mm 12.5 mm 50 mm Werk 7
Show 4 more
Watch Ø Thickness Lug-to-lug Calibre
Flieger F-43 Bicompax F4240004 43 mm 15.5 mm 54 mm UW-51
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

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