Seiko Cal. 7181 - 550

Seiko 7181-550

This Spring Drive model from 1965 features a 37mm Hardlex-Coated Steel case. The Bidirectional bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-8df22f259466]

Also known as: Monster, Golden Tuna

Specifications

Movement
Spring Drive
Case Material
Hardlex-Coated Steel
Case Width
37mm
Case Thickness
14.7mm
Lug Width
18mm
Crystal
Acrylic
Bezel
Bidirectional
Water Resistance
180m
Dial Color
Cream
Jewels
22j
Frequency
28,800 bph
Power Reserve
51 hours
Year
1965

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