Seiko Cal. 6658 - 684

Released in 1990, the Cal. 6658 with design code 684 was part of Seiko's domestic market collection. Powered by the 6658 caliber with 29j jewels beating at 36,000 bph, it delivers a 58 hours power reserve. [seikata-wm-286fc2df7faa]

Also known as: Monster, Tuna

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

11.0mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Blue Sunburst

Jewels

29j

Frequency

36,000 bph

Power Reserve

58 hours

Year

1990

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