Seiko Cal. 5646 - 939

The Seiko 5646-939 represents an important milestone in Seiko's 1966 lineup. The Coin-Edge bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-8a4dcb108b3a]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

41mm

Case Thickness

10.2mm

Lug Width

18mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

White

Jewels

17j

Frequency

28,800 bph

Power Reserve

67 hours

Year

1966

Related Models

• Seiko 0738-281
• Seiko 6391-527
• Seiko 5630-576
• Seiko 6615-733
• Seiko 4440-998
• Seiko 6335-389
• Seiko 4525-341
• Seiko 3854-998
• Seiko 3811-148
• Seiko 7128-249
• Seiko 6279-229
• Seiko 6273-209