Seiko Cal. 5646 - 737

The 5646-737 is a sought-after Hand-Winding piece from Seiko's golden era. The Bidirectional bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-7ba7fa21c521]

Also known as: Sportsmatic, Golden Tuna

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

41mm

Case Thickness

13.8mm

Lug Width

22mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

40m

Dial Color

Navy

Jewels

35j

Frequency

21,600 bph

Power Reserve

60 hours

Year

1985

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