Seiko Cal. 0721 - 631

Seiko 0721-631

The 0721-631 is a sought-after Spring Drive piece from Seiko's golden era. It features a Burgundy dial protected by a Mineral crystal and offers 100m of water resistance. [seikata-wm-42a8f0b0e29e]

Also known as: Arnie

Specifications

Movement
Spring Drive
Case Material
Stainless Steel
Case Width
37mm
Case Thickness
14.7mm
Lug Width
22mm
Crystal
Mineral
Bezel
Bidirectional
Water Resistance
100m
Dial Color
Burgundy
Jewels
36j
Frequency
21,600 bph
Power Reserve
61 hours
Year
1999

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