Seiko Cal. 6240 - 977

Seiko 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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