Seiko Cal. 6646 - 837

The Seiko 6646-837 represents an important milestone in Seiko's 1991 lineup. The Bidirectional bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-b0d02c18cf38]

Also known as: Tuna, UFO

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

36mm

Case Thickness

9.7mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Champagne

Jewels

34j

Frequency

21,600 bph

Power Reserve

55 hours

Year

1991

Related Models

• Seiko 0799-504
• Seiko 6296-838
• Seiko 7152-776
• Seiko 0754-999
• Seiko 7176-862
• Seiko 4489-523
• Seiko 5270-431
• Seiko 0761-116
• Seiko 6619-892
• Seiko 7143-513
• Seiko 6286-465
• Seiko 6630-150