Seiko Cal. 5621 - 721

Seiko 5621-721

The Seiko 5621-721 represents an important milestone in Seiko's 1973 lineup. Powered by the 5621 caliber with 31j jewels beating at 36,000 bph, it delivers a 61 hours power reserve. [seikata-wm-b0c8ab046866]

Also known as: Baby Tuna

Specifications

Movement
Spring Drive
Case Material
Titanium
Case Width
35mm
Case Thickness
11.7mm
Lug Width
21mm
Crystal
Acrylic
Bezel
Fixed
Water Resistance
40m
Dial Color
Black
Jewels
31j
Frequency
36,000 bph
Power Reserve
61 hours
Year
1973

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seikata-wm-b0c8ab046866