Seiko Cal. 6640 - 287

The 6640-287 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6640 caliber with 32j jewels beating at 36,000 bph, it delivers a 39 hours power reserve. [seikata-wm-218df9d1e69e]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

40mm

Case Thickness

10.3mm

Lug Width

20mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

50m

Dial Color

Champagne

Jewels

32j

Frequency

36,000 bph

Power Reserve

39 hours

Year

1994

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