Side by side
Fortis Marinemaster M-40vsOak & Oscar The Olmsted Windup Edition
The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.
At a glance
18 of 29 specs differDiameter
Marinemaster M-4040mm
The Olmsted Windup Edition38mm
Power Reserve
Marinemaster M-4038h
The Olmsted Windup Edition50h
Water Resistance
Marinemaster M-40300m
The Olmsted Windup Edition100m
MSRP
Marinemaster M-40$3,520
The Olmsted Windup Edition$1,775
Full specifications
Case
8 specsCategory
Diver
Field
Diameter
40mm
38mm
Thickness
13mm
10.8mm
Lug-to-Lug
—
44.9mm
Lug Width
21mm
20mm
Material
Stainless Steel
316L Stainless Steel
Water Resistance
300m
100m
Caseback
Solid
Engraved
Crystal & Dial
4 specsCrystal Shape
Flat
Double-domed
AR Coating
Inner
Underside
Dial Color
Orange
Grey
Lume
None
Super-LumiNova
Movement
5 specsCaliber
Sellita SW220-1
Sellita SW300
Beat Rate
28,800 vph
4 vph
Power Reserve
38h
50h
Jewels
26
25
Complications
None
GMT, Chronograph, Date
Pricing
1 specsMSRP
$3,520
$1,775
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