Seiko Cal. 6331 - 513

The Seiko 6331-513 represents an important milestone in Seiko's 1973 lineup. It features a Green dial protected by a Hardlex crystal and offers 30m of water resistance. [seikata-wm-0d60f6fc8ba7]

Also known as: Bullhead

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

46mm

Case Thickness

8.9mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

30m

Dial Color

Green

Jewels

30j

Frequency

36,000 bph

Power Reserve

62 hours

Year

1973

Related Models

• Seiko 6198-822
• Seiko 6657-760
• Seiko 6693-246
• Seiko 6623-192
• Seiko 4580-919
• Seiko 4564-844
• Seiko 3876-851
• Seiko 6648-811
• Seiko 6654-761
• Seiko 7164-467
• Seiko 5687-843
• Seiko 7068-158