Seiko Cal. 6231 - 993

The Seiko 6231-993 represents an important milestone in Seiko's 1966 lineup. Powered by the 6231 caliber with 20j jewels beating at 21,600 bph, it delivers a 52 hours power reserve. [seikata-wm-22f66d0b3be1]

Also known as: Monster, UFO

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

11.6mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

Blue Sunburst

Jewels

20j

Frequency

21,600 bph

Power Reserve

52 hours

Year

1966

Related Models

• Seiko 4537-238
• Seiko 4545-598
• Seiko 0778-834
• Seiko 3838-889
• Seiko 3811-406
• Seiko 4558-651
• Seiko 7139-940
• Seiko 6295-853
• Seiko 3885-339
• Seiko 6127-935
• Seiko 0720-143
• Seiko 3860-159