Seiko Cal. 6331 - 320

Released in 1997, the Cal. 6331 with design code 320 was part of Seiko's domestic market collection. Powered by the 6331 caliber with 30j jewels beating at 36,000 bph, it delivers a 52 hours power reserve. [seikata-wm-2ac462b3a5b7]

Also known as: Baby Tuna

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

37mm

Case Thickness

11.5mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Black

Jewels

30j

Frequency

36,000 bph

Power Reserve

52 hours

Year

1997

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