Seiko Cal. 6637 - 818

This Automatic model from 1987 features a 36mm Two-Tone case. Powered by the 6637 caliber with 24j jewels beating at 36,000 bph, it delivers a 71 hours power reserve. [seikata-wm-20b6483cbfb0]

Also known as: Bullhead, Baby Tuna

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

36mm

Case Thickness

11.2mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

200m

Dial Color

Cream

Jewels

24j

Frequency

36,000 bph

Power Reserve

71 hours

Year

1987

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