Seiko Cal. 6640 - 815

The 6640-815 is a sought-after Quartz piece from Seiko's golden era. It features a Cream dial protected by a Mineral crystal and offers 90m of water resistance. [seikata-wm-4fe90af3efc4]

Also known as: UFO

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

40mm

Case Thickness

10.3mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

90m

Dial Color

Cream

Jewels

28j

Frequency

36,000 bph

Power Reserve

70 hours

Year

1985

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