Seiko Cal. 6631 - 417

The 6631-417 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6631 caliber with 26j jewels beating at 21,600 bph, it delivers a 44 hours power reserve. [seikata-wm-6afa4eefd2f2]

Also known as: Bullhead, Bellmatic

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

41mm

Case Thickness

11.3mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

50m

Dial Color

Blue Sunburst

Jewels

26j

Frequency

21,600 bph

Power Reserve

44 hours

Year

1994

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