Seiko Cal. 6653 - 387

The 6653-387 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6653 caliber with 31j jewels beating at 36,000 bph, it delivers a 37 hours power reserve. [seikata-wm-1e4bf33f732b]

Also known as: Bullhead, Bellmatic

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

36mm

Case Thickness

12.7mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Black

Jewels

31j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1974

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