Seiko Cal. 5240 - 357

Seiko 5240-357

The 5240-357 is a sought-after Automatic piece from Seiko's golden era. Powered by the 5240 caliber with 25j jewels beating at 21,600 bph, it delivers a 37 hours power reserve. [seikata-wm-376abddd69d2]

Also known as: UFO, Sea Horse

Specifications

Movement
Automatic
Case Material
Stainless Steel
Case Width
42mm
Case Thickness
8.3mm
Lug Width
18mm
Crystal
Sapphire
Bezel
Bidirectional
Water Resistance
130m
Dial Color
Green
Jewels
25j
Frequency
21,600 bph
Power Reserve
37 hours
Year
1966

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