Seiko Cal. 6631 - 323

The 6631-323 is a sought-after Solar piece from Seiko's golden era. Powered by the 6631 caliber with 19j jewels beating at 28,800 bph, it delivers a 57 hours power reserve. [seikata-wm-3e9a4d5bf9fa]

Also known as: Bellmatic, Baby Tuna

Specifications

Movement

Solar

Case Material

Titanium

Case Width

37mm

Case Thickness

11.5mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

140m

Dial Color

Green

Jewels

19j

Frequency

28,800 bph

Power Reserve

57 hours

Year

1997

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