Seiko Cal. 5640 - 310

The Seiko 5640-310 represents an important milestone in Seiko's 1969 lineup. It features a Silver dial protected by a Sapphire crystal and offers 80m of water resistance. [seikata-wm-f01882447a49]

Also known as: Baby Tuna

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

39mm

Case Thickness

10.4mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Silver

Jewels

32j

Frequency

28,800 bph

Power Reserve

58 hours

Year

1969

Related Models

• Seiko 0788-434
• Seiko 7054-720
• Seiko 6630-373
• Seiko 5237-908
• Seiko 3883-747
• Seiko 4543-820
• Seiko 6151-370
• Seiko 5254-174
• Seiko 4519-930
• Seiko 6164-153
• Seiko 7134-988
• Seiko 0755-814