Seiko Cal. 5231 - 991

Released in 1987, the Cal. 5231 with design code 991 was part of Seiko's domestic market collection. It features a Green dial protected by a Sapphire crystal and offers 90m of water resistance. [seikata-wm-993992cbf046]

Also known as: Shogun, Emperor

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

46mm

Case Thickness

13.7mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Green

Jewels

28j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1987

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