Seiko Cal. 6646 - 537

Seiko 6646-537

The 6646-537 is a sought-after Spring Drive piece from Seiko's golden era. It features a Black dial protected by a Hardlex crystal and offers 140m of water resistance. [seikata-wm-df0fe6853776]

Also known as: Sportsmatic

Specifications

Movement
Spring Drive
Case Material
Stainless Steel
Case Width
45mm
Case Thickness
13.6mm
Lug Width
22mm
Crystal
Hardlex
Bezel
Bidirectional
Water Resistance
140m
Dial Color
Black
Jewels
28j
Frequency
21,600 bph
Power Reserve
49 hours
Year
1982

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seikata-wm-df0fe6853776