Seiko Cal. 6618 - 521

The Seiko 6618-521 represents an important milestone in Seiko's 1978 lineup. Powered by the 6618 caliber with 31j jewels beating at 36,000 bph, it delivers a 36 hours power reserve. [seikata-wm-b73a17df37bd]

Also known as: Crown, Flighty

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

8.8mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

90m

Dial Color

Green

Jewels

31j

Frequency

36,000 bph

Power Reserve

36 hours

Year

1978

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