Seiko Cal. 6687 - 778

Released in 1974, the Cal. 6687 with design code 778 was part of Seiko's domestic market collection. Powered by the 6687 caliber with 30j jewels beating at 36,000 bph, it delivers a 42 hours power reserve. [seikata-wm-e220400e28a1]

Also known as: Sumo, Crown

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

43mm

Case Thickness

8.5mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Burgundy

Jewels

30j

Frequency

36,000 bph

Power Reserve

42 hours

Year

1974

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