Seiko Cal. 5663 - 740

Seiko 5663-740

The Seiko 5663-740 represents an important milestone in Seiko's 1986 lineup. Powered by the 5663 caliber with 31j jewels beating at 36,000 bph, it delivers a 47 hours power reserve. [seikata-wm-79bb1cf07e49]

Also known as: Navigator, Baby Tuna

Specifications

Movement
Solar
Case Material
Hardlex-Coated Steel
Case Width
37mm
Case Thickness
15.6mm
Lug Width
22mm
Crystal
Sapphire
Bezel
Bidirectional
Water Resistance
110m
Dial Color
Green
Jewels
31j
Frequency
36,000 bph
Power Reserve
47 hours
Year
1986

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