Seiko Cal. 6640 - 375

The 6640-375 is a sought-after Hand-Winding piece from Seiko's golden era. It features a Burgundy dial protected by a Acrylic crystal and offers 60m of water resistance. [seikata-wm-d7b68a900664]

Also known as: Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

11.2mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

60m

Dial Color

Burgundy

Jewels

19j

Frequency

28,800 bph

Power Reserve

61 hours

Year

1988

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