Seiko Cal. 5631 - 591

Released in 1984, the Cal. 5631 with design code 591 was part of Seiko's domestic market collection. It features a White dial protected by a Sapphire crystal and offers 180m of water resistance. [seikata-wm-dd1642ca9d22]

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

34mm

Case Thickness

9.7mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

180m

Dial Color

White

Jewels

25j

Frequency

21,600 bph

Power Reserve

45 hours

Year

1984

Related Models

• Seiko 3870-913
• Seiko 6153-481
• Seiko 5240-242
• Seiko 0722-479
• Seiko 4520-940
• Seiko 6159-723
• Seiko 7118-652
• Seiko 6613-529
• Seiko 6643-326
• Seiko 6654-192
• Seiko 6328-140
• Seiko 6383-887