Seiko Cal. 6640 - 836

The 6640-836 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 6640 caliber with 17j jewels beating at 21,600 bph, it delivers a 40 hours power reserve. [seikata-wm-9d9171f4680c]

Also known as: Tuna

Specifications

Movement

Kinetic

Case Material

Gold-Plated

Case Width

34mm

Case Thickness

10.6mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

110m

Dial Color

Silver

Jewels

17j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1998

Related Models

• Seiko 6647-680
• Seiko 4513-232
• Seiko 7013-473
• Seiko 4539-416
• Seiko 6637-154
• Seiko 5666-376
• Seiko 5611-558
• Seiko 3859-814
• Seiko 6615-549
• Seiko 5659-390
• Seiko 6145-914
• Seiko 6685-398