Grand Seiko Watch Dimensions: Diameter, Thickness, Lug-to-Lug

Grand Seiko spans Heritage (Snowflake, White Birch, Mt. Iwate at 40-41mm), the smaller Elegance dress watches at 36.5-38.5mm, sport divers up to 44.2mm, and the high-precision 9F Quartz line at 39-40mm. Spring Drive cases run thicker than mechanical Hi-Beat by ~1mm.

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Family:

Family	Model	Reference	Diameter	Thickness	Lug-to-Lug	Lug Width	Bracelet Taper	Water	Movement
Heritage	Snowflake (Spring Drive)	SBGA211	41 mm	12.8 mm	49.0 mm	21 mm	21 → 18 mm	100 m	Cal. 9R65
Heritage	White Birch (Hi-Beat)	SLGH005	40 mm	11.7 mm	47.0 mm	20 mm	20 → 16 mm	100 m	Cal. 9SA5
Heritage	Shunbun (Spring Drive)	SBGA413	41 mm	12.8 mm	49.0 mm	21 mm	21 → 18 mm	100 m	Cal. 9R65
Heritage	Skyflake (Spring Drive)	SBGA407	40 mm	12.5 mm	47.0 mm	20 mm	20 → 16 mm	100 m	Cal. 9R65
Heritage	Peacock (Spring Drive)	SBGA497	41 mm	12.5 mm	49.0 mm	21 mm	21 → 18 mm	100 m	Cal. 9R65
Heritage	Heritage 62GS	SLGA015	39.5 mm	11.6 mm	46.0 mm	19 mm	19 → 16 mm	100 m	Cal. 9RA5
Heritage	Heritage 44GS	SBGH273	40 mm	13.3 mm	47.0 mm	20 mm	20 → 16 mm	100 m	Cal. 9S85
Heritage	Heritage 36 Automatic	SBGR305	36.5 mm	11.6 mm	42.0 mm	19 mm	19 → 15 mm (leather)	100 m	Cal. 9S65
Sport	Diver 200M (Spring Drive)	SBGA463	44.2 mm	14 mm	50.7 mm	20 mm	20 → 18 mm (rubber)	200 m	Cal. 9R65
Sport	Diver Hi-Beat Blue Lagoon	SBGH257	44.2 mm	13.3 mm	51.0 mm	20 mm	20 → 18 mm (titanium)	200 m	Cal. 9S85
Sport	Evolution 9 Sport Diver	SLGA023	43.8 mm	13.4 mm	50.5 mm	20 mm	20 → 18 mm	200 m	Cal. 9RA5
Sport	GMT (Spring Drive)	SBGE277	44 mm	14.7 mm	51.0 mm	21 mm	21 → 18 mm	200 m	Cal. 9R66
Sport	Sport GMT Automatic	SBGM221	39.5 mm	13.7 mm	46.0 mm	19 mm	19 → 16 mm	100 m	Cal. 9S66
Sport	Spring Drive Chrono GMT	SBGC240	46.4 mm	16.8 mm	52.5 mm	21 mm	21 → 18 mm (titanium)	200 m	Cal. 9R96
Sport	Tentagraph	SLGC001	43.2 mm	15.3 mm	51.5 mm	21 mm	21 → 18 mm	100 m	Cal. 9SC5
Elegance	Elegance Manual-Wind	SBGW231	37.3 mm	11.6 mm	43.5 mm	19 mm	19 → 15 mm (leather)	30 m	Cal. 9S64
Elegance	Elegance Automatic	SBGK005	39.5 mm	11.2 mm	46.0 mm	19 mm	19 → 16 mm (leather)	30 m	Cal. 9S63
Elegance	Elegance Slim Spring Drive	SBGY007	39 mm	10.2 mm	46.0 mm	19 mm	19 → 16 mm (leather)	30 m	Cal. 9R31
Elegance	Omiwatari	SBGY013	38.5 mm	10.2 mm	46.0 mm	19 mm	19 → 16 mm (leather)	30 m	Cal. 9R31
Elegance	Godai Chronograph	SBGH318	40.5 mm	14 mm	47.0 mm	19 mm	19 → 16 mm	100 m	Cal. 9S85
Elegance	Elegance Ladies 27.4	STGF275	27.4 mm	11.2 mm	34.0 mm	12 mm	12 → 10 mm (leather)	30 m	Cal. 9S27
Evolution 9	Evolution 9 Time-Only	SLGH017	40 mm	11.7 mm	47.0 mm	20 mm	20 → 16 mm	100 m	Cal. 9SA5
Evolution 9	Evolution 9 Spring Drive	SLGA009	40 mm	11.8 mm	47.0 mm	20 mm	20 → 16 mm	100 m	Cal. 9RA5
Evolution 9	Evolution 9 Kishun	SLGH013	40 mm	11.7 mm	47.0 mm	20 mm	20 → 16 mm	100 m	Cal. 9SA5
Kodo	Kodo Constant Force Tourbillon	SLGT003	43.8 mm	12.9 mm	51.0 mm	22 mm	22 → 18 mm (leather)	50 m	Cal. 9ST1

Specs from the manufacturer's published technical data. Lug-to-lug values reflect commonly-cited caliper measurements where the manufacturer does not publish them and may vary by ±0.5 mm. References cover the principal current production variants per family - bezel, dial, and metal-option references usually share case dimensions.

Grand Seiko Watch Dimensions

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