Seiko Cal. 5661 - 818

Seiko 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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