Promaster Dive Eco-Drive

Ref. BN0151-09L

Case diameter: 44 mm; Manufacturer spec
Lug-to-lug: 48 mm; Measured in a published review
Thickness: 11.5 mm; Measured in a published review
Lug width: 20 mm; Manufacturer spec

Retail price $450 (US, Oct 2026)

Your wristIdeal fit

Wrist flat: 55.1 mmLug-to-lug: 48 mm

How the Promaster Dive Eco-Drive wears

Its lugs add only 4 mm to the 44 mm case, against 7.1 mm typical across the almanac, so it wears smaller than its diameter suggests.

On our fit model it sits best on wrists from 6.75" to 8" (17.1–20.3 cm); below 6.75" the lugs start to reach the edge of the wrist.

At 11.5 mm thick it is slimmer than 92% of the 79 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; 104 other watches here share it, so aftermarket straps are easy to find.

Will the Promaster Dive Eco-Drive fit your wrist?

With a 48 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	Lugs overhang
6.5"	51.2 mm	Snug, lugs near the edge
7"	55.1 mm	Ideal fit
7.5"	59.1 mm	Ideal fit
8"	63 mm	Ideal fit

Specifications

Reference: BN0151-09L
Collection: Promaster
Status: In production
Case material: stainless steel
Crystal: anti-reflective mineral
Water resistance: 200 m
Bezel: unidirectional rotating
Dial: blue
Strap / bracelet: polyurethane strap
Style: Dive

Movement

Caliber: Citizen E168
Type: solar
Accuracy: +/-15 s/month

Compare

Promaster Dive Eco-Drive vs Seiko Seiko 5 Sports SKX Sports Style

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

More Promaster references

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 Promaster Dive Eco-Drive.