Seiko Cal. 3845 - 631

The Seiko 3845-631 represents an important milestone in Seiko's 1977 lineup. With its 19mm lug width and 15.8mm profile, it sits comfortably on most wrists. [seikata-wm-2a35fd7f26e5]

Also known as: Sumo

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

44mm

Case Thickness

15.8mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

100m

Dial Color

Champagne

Jewels

19j

Frequency

21,600 bph

Power Reserve

41 hours

Year

1977

Related Models

• Seiko 6334-468
• Seiko 5228-161
• Seiko 6262-391
• Seiko 7130-166
• Seiko 7071-335
• Seiko 4525-633
• Seiko 4515-356
• Seiko 0771-876
• Seiko 7121-614
• Seiko 6263-416
• Seiko 5641-244
• Seiko 5290-900