Seiko Cal. 6240 - 977

The 6240-977 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6240 caliber with 25j jewels beating at 21,600 bph, it delivers a 57 hours power reserve. [seikata-wm-50232ebbcfb1]

Also known as: Sportsmatic, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

13.8mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Navy

Jewels

25j

Frequency

21,600 bph

Power Reserve

57 hours

Year

1970

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