Seiko Cal. 4487 - 291

The 4487-291 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 4487 caliber with 28j jewels beating at 28,800 bph, it delivers a 37 hours power reserve. [seikata-wm-d02a224919f6]

Also known as: Bellmatic, Arnie

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

13.9mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

40m

Dial Color

Navy

Jewels

28j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1994

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