Seiko Cal. 6397 - 991

This Solar model from 1976 features a 44mm PVD Black case. Powered by the 6397 caliber with 35j jewels beating at 28,800 bph, it delivers a 57 hours power reserve. [seikata-wm-89c400a6e9ae]

Also known as: Sumo, Helmet

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

44mm

Case Thickness

10.7mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

160m

Dial Color

White

Jewels

35j

Frequency

28,800 bph

Power Reserve

57 hours

Year

1976

Related Models

• Seiko 3876-992
• Seiko 6131-632
• Seiko 6281-980
• Seiko 7172-746
• Seiko 5698-899
• Seiko 6371-824
• Seiko 6679-857
• Seiko 6610-611
• Seiko 0712-779
• Seiko 7082-500
• Seiko 7054-232
• Seiko 3818-781