Seiko Cal. 5691 - 437

Seiko 5691-437

The Seiko 5691-437 represents an important milestone in Seiko's 1987 lineup. Powered by the 5691 caliber with 25j jewels beating at 28,800 bph, it delivers a 48 hours power reserve. [seikata-wm-0dc955c48dc6]

Also known as: Monster, Sportsmatic

Specifications

Movement
Solar
Case Material
Stainless Steel
Case Width
36mm
Case Thickness
11.5mm
Lug Width
20mm
Crystal
Sapphire
Bezel
Coin-Edge
Water Resistance
40m
Dial Color
Blue Sunburst
Jewels
25j
Frequency
28,800 bph
Power Reserve
48 hours
Year
1987

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seikata-wm-0dc955c48dc6