Seiko Cal. 5231 - 721

The Seiko 5231-721 represents an important milestone in Seiko's 1977 lineup. It features a Navy dial protected by a Mineral crystal and offers 140m of water resistance. [seikata-wm-56c79d0119d2]

Also known as: World Timer

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

36mm

Case Thickness

13.9mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Navy

Jewels

32j

Frequency

36,000 bph

Power Reserve

58 hours

Year

1977

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