Seiko Cal. 5631 - 897

The 5631-897 is a sought-after Spring Drive piece from Seiko's golden era. It features a Navy dial protected by a Sapphire crystal and offers 40m of water resistance. [seikata-wm-361fc470ca06]

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

35mm

Case Thickness

9.2mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

40m

Dial Color

Navy

Jewels

20j

Frequency

36,000 bph

Power Reserve

72 hours

Year

1971

Related Models

• Seiko 6323-301
• Seiko 4432-570
• Seiko 0763-406
• Seiko 0755-912
• Seiko 6293-848
• Seiko 6320-553
• Seiko 6649-884
• Seiko 6640-888
• Seiko 3849-413
• Seiko 7162-721
• Seiko 4497-374
• Seiko 4593-100