Seiko Cal. 6631 - 373

The Seiko 6631-373 represents an important milestone in Seiko's 1980 lineup. Powered by the 6631 caliber with 20j jewels beating at 28,800 bph, it delivers a 40 hours power reserve. [seikata-wm-d5a780abd269]

Also known as: Bellmatic

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

40mm

Case Thickness

10.8mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

140m

Dial Color

Silver

Jewels

20j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1980

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