Seiko Cal. 4537 - 409

The 4537-409 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 4537 caliber with 20j jewels beating at 36,000 bph, it delivers a 54 hours power reserve. [seikata-wm-3d447838e5ed]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

39mm

Case Thickness

9.0mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Black

Jewels

20j

Frequency

36,000 bph

Power Reserve

54 hours

Year

1966

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