Seiko Cal. 6637 - 323

The Seiko 6637-323 represents an important milestone in Seiko's 1977 lineup. It features a Cream dial protected by a Sapphire crystal and offers 50m of water resistance. [seikata-wm-1a7ebfdc904d]

Also known as: Bullhead

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

42mm

Case Thickness

14.2mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

50m

Dial Color

Cream

Jewels

23j

Frequency

28,800 bph

Power Reserve

38 hours

Year

1977

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