Seiko Cal. 6688 - 506

The Seiko 6688-506 represents an important milestone in Seiko's 1972 lineup. Powered by the 6688 caliber with 30j jewels beating at 36,000 bph, it delivers a 36 hours power reserve. [seikata-wm-1d28b5fa35e3]

Also known as: Sumo, Navigator

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

46mm

Case Thickness

15.3mm

Lug Width

21mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

140m

Dial Color

Silver

Jewels

30j

Frequency

36,000 bph

Power Reserve

36 hours

Year

1972

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