Seiko Cal. 6640 - 685

The 6640-685 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6640 caliber with 34j jewels beating at 28,800 bph, it delivers a 48 hours power reserve. [seikata-wm-90968ac8fdcc]

Also known as: Turtle, Helmet

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

42mm

Case Thickness

11.2mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Navy

Jewels

34j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1993

Related Models

• Seiko 7050-936
• Seiko 5646-815
• Seiko 7084-623
• Seiko 6366-468
• Seiko 0759-354
• Seiko 7014-822
• Seiko 3893-830
• Seiko 6182-889
• Seiko 7191-390
• Seiko 5653-769
• Seiko 4411-319
• Seiko 6220-199