Seiko Cal. 6640 - 273

The 6640-273 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6640 caliber with 31j jewels beating at 21,600 bph, it delivers a 46 hours power reserve. [seikata-wm-cf3cd73b046c]

Also known as: Shogun, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

39mm

Case Thickness

13.1mm

Lug Width

21mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Champagne

Jewels

31j

Frequency

21,600 bph

Power Reserve

46 hours

Year

1978

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