Seiko Cal. 5640 - 315

The Seiko 5640-315 represents an important milestone in Seiko's 1983 lineup. Powered by the 5640 caliber with 31j jewels beating at 36,000 bph, it delivers a 37 hours power reserve. [seikata-wm-6905f69b7432]

Also known as: Helmet

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

37mm

Case Thickness

8.6mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

Green

Jewels

31j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1983

Related Models

• Seiko 4568-964
• Seiko 7142-239
• Seiko 7075-649
• Seiko 0794-755
• Seiko 4554-132
• Seiko 4432-262
• Seiko 6297-542
• Seiko 3893-538
• Seiko 4461-280
• Seiko 6139-629
• Seiko 6376-233
• Seiko 0721-496