Seiko Cal. 6637 - 688

The 6637-688 is a sought-after Solar piece from Seiko's golden era. It features a Burgundy dial protected by a Sapphire crystal and offers 50m of water resistance. [seikata-wm-7c64e35a34b3]

Also known as: Baby Tuna

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

45mm

Case Thickness

11.5mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Burgundy

Jewels

24j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1979

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