Seiko Cal. 6398 - 637

The Seiko 6398-637 represents an important milestone in Seiko's 1970 lineup. Powered by the 6398 caliber with 26j jewels beating at 36,000 bph, it delivers a 66 hours power reserve. [seikata-wm-68dfa5c023ee]

Also known as: Golden Tuna

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

37mm

Case Thickness

9.1mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

170m

Dial Color

Blue Sunburst

Jewels

26j

Frequency

36,000 bph

Power Reserve

66 hours

Year

1970

Related Models

• Seiko 3899-439
• Seiko 4561-725
• Seiko 4467-373
• Seiko 5268-264
• Seiko 6126-946
• Seiko 6159-494
• Seiko 6358-660
• Seiko 7091-454
• Seiko 5689-981
• Seiko 0720-185
• Seiko 7045-213
• Seiko 0737-772