Seiko Cal. 7156 - 304

Seiko 7156-304

The Seiko 7156-304 represents an important milestone in Seiko's 1971 lineup. Powered by the 7156 caliber with 30j jewels beating at 28,800 bph, it delivers a 40 hours power reserve. [seikata-wm-2ad4b7a05f14]

Also known as: Monster, Sportsmatic

Specifications

Movement
Automatic
Case Material
PVD Black
Case Width
45mm
Case Thickness
10.6mm
Lug Width
19mm
Crystal
Sapphire
Bezel
Rotating
Water Resistance
80m
Dial Color
Black
Jewels
30j
Frequency
28,800 bph
Power Reserve
40 hours
Year
1971

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