Seiko Cal. 6687 - 304

Released in 1965, the Cal. 6687 with design code 304 was part of Seiko's domestic market collection. Powered by the 6687 caliber with 29j jewels beating at 28,800 bph, it delivers a 37 hours power reserve. [seikata-wm-8ffb9050270f]

Also known as: Rally, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

43mm

Case Thickness

11.5mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

90m

Dial Color

White

Jewels

29j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1965

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