Seiko Cal. 6640 - 315

The 6640-315 is a sought-after Spring Drive piece from Seiko's golden era. It features a Silver dial protected by a Hardlex crystal and offers 140m of water resistance. [seikata-wm-6dc3bb6f07de]

Also known as: Silverwave, Navigator

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

10.8mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

140m

Dial Color

Silver

Jewels

18j

Frequency

36,000 bph

Power Reserve

46 hours

Year

1996

Related Models

• Seiko 5238-990
• Seiko 7057-769
• Seiko 7026-900
• Seiko 5640-762
• Seiko 5694-730
• Seiko 4436-911
• Seiko 4527-399
• Seiko 4468-150
• Seiko 4427-567
• Seiko 6199-708
• Seiko 5251-313
• Seiko 5250-924