Seiko Cal. 6640 - 302

The 6640-302 is a sought-after Spring Drive piece from Seiko's golden era. It features a Champagne dial protected by a Mineral crystal and offers 30m of water resistance. [seikata-wm-c6159c1dd47b]

Also known as: World Timer

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

35mm

Case Thickness

12.8mm

Lug Width

18mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

30m

Dial Color

Champagne

Jewels

30j

Frequency

36,000 bph

Power Reserve

69 hours

Year

1980

Related Models

• Seiko 5615-381
• Seiko 7178-404
• Seiko 6644-636
• Seiko 4477-381
• Seiko 6688-678
• Seiko 6680-149
• Seiko 6374-557
• Seiko 5286-131
• Seiko 0763-335
• Seiko 6320-770
• Seiko 0764-996
• Seiko 6294-261