Seiko Cal. 5631 - 684

Released in 1997, the Cal. 5631 with design code 684 was part of Seiko's domestic market collection. The Inner Rotating bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-ad4cad4c78f4]

Also known as: Rally, Baby Tuna

Specifications

Movement

Solar

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

10.6mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Silver

Jewels

19j

Frequency

21,600 bph

Power Reserve

47 hours

Year

1997

Related Models

• Seiko 4581-624
• Seiko 5292-480
• Seiko 5616-566
• Seiko 0752-308
• Seiko 6323-392
• Seiko 4588-979
• Seiko 6222-485
• Seiko 0729-128
• Seiko 7067-597
• Seiko 4562-703
• Seiko 6116-710
• Seiko 4588-704