1970 Automatic Diver 40mm

Ref. DH70-40M-O12

Case diameter: 40 mm; Manufacturer spec
Lug-to-lug: 45.7 mm; Manufacturer spec
Thickness: 14.8 mm; Manufacturer spec
Lug width: 22 mm; Manufacturer spec

Retail price $320 (US, Oct 2026)

Your wristIdeal fit

Wrist flat: 55.1 mmLug-to-lug: 45.7 mm

How the 1970 Automatic Diver 40mm wears

Its lugs add 5.7 mm to the 40 mm case, close to the 7.1 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 7.5" (16.5–19.1 cm); below 6.5" the lugs start to reach the edge of the wrist.

At 14.8 mm thick it is thicker than 92% of the 79 other dive watches we've measured, so expect it to sit tall on the wrist.

Its 22 mm lug width is one of the most common strap sizes; 27 other watches here share it, so aftermarket straps are easy to find.

Will the 1970 Automatic Diver 40mm fit your wrist?

With a 45.7 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.

Wrist	Flat width (est.)	Fit
6"	47.2 mm	Snug, lugs near the edge
6.5"	51.2 mm	Ideal fit
7"	55.1 mm	Ideal fit
7.5"	59.1 mm	Ideal fit
8"	63 mm	Wears small

Specifications

Reference: DH70-40M-O12
Collection: 1970
Status: In production
Case material: stainless steel
Crystal: mineral (sapphire-coated, double-domed)
Water resistance: 200 m
Bezel: internal 60-minute rotating bezel (2 o'clock crown)
Dial: matte black with orange chapter ring
Strap / bracelet: rubber strap
Style: Dive

Movement

Caliber: Seiko Instruments (TMI) Seiko NH35
Type: automatic
Power reserve: 41 hours
Jewels: 24

Takes 22 mm straps. See other 22 mm watches and straps.

Watches that wear the same size

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

Same 22 mm lug width

All 22 mm watches

These take the same straps as the 1970 Automatic Diver 40mm.

Sources

danhenrywatches.com/products/1970-automatic-diver-watch