Seiko Cal. 6398 - 645

The Seiko 6398-645 represents an important milestone in Seiko's 1977 lineup. Powered by the 6398 caliber with 23j jewels beating at 28,800 bph, it delivers a 36 hours power reserve. [seikata-wm-c3dfc72cdb4c]

Also known as: Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

38mm

Case Thickness

14.6mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

150m

Dial Color

Navy

Jewels

23j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1977

Related Models

• Seiko 6295-240
• Seiko 6661-521
• Seiko 4533-467
• Seiko 5647-679
• Seiko 6681-506
• Seiko 0741-544
• Seiko 4582-451
• Seiko 6354-605
• Seiko 6659-140
• Seiko 0797-889
• Seiko 5669-240
• Seiko 7187-835