Seiko Cal. 5661 - 818

The Seiko 5661-818 represents an important milestone in Seiko's 1978 lineup. Powered by the 5661 caliber with 17j jewels beating at 28,800 bph, it delivers a 72 hours power reserve. [seikata-wm-dcffa2cd9adc]

Also known as: Baby Tuna

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

40mm

Case Thickness

8.1mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

110m

Dial Color

Cream

Jewels

17j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1978

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