Seiko Cal. 6231 - 990

The 6231-990 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6231 caliber with 33j jewels beating at 36,000 bph, it delivers a 58 hours power reserve. [seikata-wm-c729d35001a4]

Also known as: Turtle, Bullhead

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

39mm

Case Thickness

13.4mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Burgundy

Jewels

33j

Frequency

36,000 bph

Power Reserve

58 hours

Year

1985

Related Models

• Seiko 7125-787
• Seiko 6140-885
• Seiko 4419-854
• Seiko 6374-577
• Seiko 0749-777
• Seiko 6123-150
• Seiko 7015-927
• Seiko 0747-984
• Seiko 7152-742
• Seiko 6636-849
• Seiko 7079-774
• Seiko 4443-235