Seiko Cal. 6631 - 261

The Seiko 6631-261 represents an important milestone in Seiko's 1970 lineup. It features a Silver dial protected by a Sapphire crystal and offers 140m of water resistance. [seikata-wm-aa8a344ed9f1]

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

10.1mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

140m

Dial Color

Silver

Jewels

36j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1970

Related Models

• Seiko 5289-803
• Seiko 4567-941
• Seiko 6153-778
• Seiko 3822-251
• Seiko 4442-356
• Seiko 4422-667
• Seiko 6147-282
• Seiko 6666-158
• Seiko 3835-529
• Seiko 4566-606
• Seiko 6294-418
• Seiko 6165-923