Watch Almanac
Zelos

Swordfish 40mm SS 'Slate'

Case diameter
40 mm
Manufacturer spec
Lug-to-lug
46 mm
Manufacturer spec
Thickness
12 mm
Manufacturer spec
Lug width
20 mm
Manufacturer spec

Retail price $399 (US, Oct 2026)

Ideal fit
Wrist flat: 55.1 mmLug-to-lug: 46 mm

How the Swordfish 40mm SS 'Slate' wears

Its lugs add 6 mm to the 40 mm case, close to the 7 mm typical across the almanac, so its diameter is a fair guide to how it wears.

On our fit model it sits best on wrists from 6.5" to 7.75" (16.5–19.7 cm); below 6.5" the lugs start to reach the edge of the wrist.

At 12 mm thick it is slimmer than 83% of the 124 other dive watches we've measured, so it slides under a cuff more easily than most.

Its 20 mm lug width is one of the most common strap sizes; 156 other watches here share it, so aftermarket straps are easy to find.

Will the Swordfish 40mm SS 'Slate' fit your wrist?

With a 46 mm lug-to-lug, here is how it wears across common wrist sizes. We estimate the flat top of each wrist from its circumference; measure yours for a closer answer in the fit finder.

WristFlat width (est.)Fit
6"47.2 mmSnug, lugs near the edge
6.5"51.2 mmIdeal fit
7"55.1 mmIdeal fit
7.5"59.1 mmIdeal fit
8"63 mmWears small

Specifications

Reference
Swordfish 40mm SS 'Slate'
Collection
Swordfish
Status
In production
Introduced
2026
Case material
316L stainless steel
Crystal
flat sapphire
Water resistance
200 m
Bezel
black sapphire bezel insert
Dial
fume dark grey
Strap / bracelet
316L steel bracelet, quick-adjust clasp, female end links
Style
Dive, Everyday

Movement

Caliber
Seiko Instruments (SII) NH35
Type
automatic

Takes 20 mm straps. See other 20 mm watches and straps.

Watches that wear the same size

Other watches within 1.5 mm of its lug-to-lug.

Same 20 mm lug width

All 20 mm watches

These take the same straps as the Swordfish 40mm SS 'Slate'.

Sources