Seiko Cal. 5644 - 633

Seiko 5644-633

The 5644-633 is a sought-after Automatic piece from Seiko's golden era. The Bidirectional bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-541af3f2f565]

Also known as: Monster, Bullhead

Specifications

Movement
Automatic
Case Material
Hardlex-Coated Steel
Case Width
35mm
Case Thickness
11.2mm
Lug Width
20mm
Crystal
Sapphire
Bezel
Bidirectional
Water Resistance
150m
Dial Color
Green
Jewels
35j
Frequency
21,600 bph
Power Reserve
45 hours
Year
1969

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