Briston Clubmaster 21644.SA.T.15.NNB

44mm · Stainless Steel, Tortoiseshell Acetate · Caliber Seiko NH35A · 300m

Briston Clubmaster Diver Pro Navy Blue

Brand: Briston
Full reference: 21644.SA.T.15.NNB
Also written as: 21644SAT15NNB
Collection: Clubmaster
Case diameter: 44mm
Case material: Stainless Steel, Tortoiseshell Acetate
Water resistance: 300m
Movement: Automatic
Caliber: Seiko NH35A
Power reserve: 41 hours
Functions / complications: Central Seconds, Date
Dial color: Blue
Bracelet / strap: Nato

Related references — same collection

Shared specifications help discovery; these links do not assert a predecessor or successor relationship.

Briston

Clubmaster

21644.SA.T.1.NB

44mmStainless Steel, Tortoiseshell Acetate

Briston

Clubmaster

17642.SA.TD.1.NB

42mmStainless Steel, Tortoiseshell Acetate

Briston

Clubmaster

17642.SA.TD.15.NNB

42mmStainless Steel, Tortoiseshell Acetate

Briston

Clubmaster

13140.SA.T.1.NK

40mmStainless Steel, Tortoiseshell Acetate

Compare specifications

Specification	21644.SA.T.15.NNB	21644.SA.T.1.NB	17642.SA.TD.1.NB	17642.SA.TD.15.NNB	13140.SA.T.1.NK
Case diameter	44mm	44mm	42mm	42mm	40mm
Case material	Stainless Steel, Tortoiseshell Acetate	Stainless Steel, Tortoiseshell Acetate	Stainless Steel, Tortoiseshell Acetate	Stainless Steel, Tortoiseshell Acetate	Stainless Steel, Tortoiseshell Acetate
Water resistance	300m	300m	200m	200m	100m
Movement	Automatic	Automatic	Automatic	Automatic	Quartz
Caliber	Seiko NH35A	Seiko NH35A	Seiko NH35A	Seiko NH35A	Miyota OS21
Power reserve	41 hours	41 hours	41 hours	41 hours	—

Sources & record notes

Displayed specifications follow the most complete source record. Other source records are retained below; conflicting values are not silently combined. The Watch Pages.

The Watch Pages ↗ · 2026-09-22 00:47:46 JST

The Watch Pages · Briston 21644.SA.T.15.NNB

Original collection: Not recorded

Technical Specifications / Date Added: March 11, 2021
Technical Specifications / Reference: 21644.SA.T.15.NNB
Technical Specifications / Brand: Briston
Technical Specifications / Case Size: 44mm
Technical Specifications / Case Material: Stainless Steel, Tortoiseshell Acetate
Technical Specifications / Dial Color: Blue
Technical Specifications / Movement: Automatic
Technical Specifications / Caliber: Seiko NH35A
Technical Specifications / Power Reserve: 41 hours
Technical Specifications / Water Resistance: 300m
Technical Specifications / Strap Material: Nato
Technical Specifications / Strap Color: Blue, Interchangeable
Technical Specifications / Buckle Type: Pin
Technical Specifications / Bezel Color: Blue
Technical Specifications / Style: Sporty
Technical Specifications / Sport: Diving
Technical Specifications / Special Features: Luminescence, Rotating Bezel, Water Resistant
Technical Specifications / Complications: Central Seconds, Date

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