Seiko Cal. 4428 - 731

Seiko 4428-731

The 4428-731 is a sought-after Automatic piece from Seiko's golden era. The Inner Rotating bezel and 45mm case give it a distinctive presence on the wrist. [seikata-wm-f39467e456cf]

Also known as: Helmet, Baby Tuna

Specifications

Movement
Automatic
Case Material
Stainless Steel
Case Width
45mm
Case Thickness
12.6mm
Lug Width
19mm
Crystal
Sapphire
Bezel
Inner Rotating
Water Resistance
90m
Dial Color
Black
Jewels
18j
Frequency
36,000 bph
Power Reserve
57 hours
Year
1969

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