Seiko Cal. 6391 - 203

The Seiko 6391-203 represents an important milestone in Seiko's 1971 lineup. Powered by the 6391 caliber with 34j jewels beating at 28,800 bph, it delivers a 55 hours power reserve. [seikata-wm-e9682379a7d2]

Also known as: Navigator

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

13.1mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

50m

Dial Color

Blue Sunburst

Jewels

34j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1971

Related Models

• Seiko 6181-933
• Seiko 7199-189
• Seiko 4430-639
• Seiko 5230-105
• Seiko 7071-601
• Seiko 5687-931
• Seiko 0765-597
• Seiko 7188-205
• Seiko 7027-770
• Seiko 4598-543
• Seiko 5231-865
• Seiko 6661-765