Seiko Cal. 6636 - 971

The Seiko 6636-971 represents an important milestone in Seiko's 1999 lineup. It features a Green dial protected by a Hardlex crystal and offers 160m of water resistance. [seikata-wm-9282bbc57fec]

Also known as: Helmet

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

46mm

Case Thickness

15.7mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

160m

Dial Color

Green

Jewels

33j

Frequency

21,600 bph

Power Reserve

48 hours

Year

1999

Related Models

• Seiko 5659-210
• Seiko 6254-894
• Seiko 6164-174
• Seiko 7084-612
• Seiko 6611-646
• Seiko 6125-981
• Seiko 3894-117
• Seiko 6186-839
• Seiko 4524-308
• Seiko 7159-560
• Seiko 5616-875
• Seiko 3879-175