Seiko Cal. 4521 - 721

This Spring Drive model from 1996 features a 37mm Two-Tone case. With its 18mm lug width and 15.3mm profile, it sits comfortably on most wrists. [seikata-wm-eac49edc50e0]

Also known as: UFO, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

37mm

Case Thickness

15.3mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Silver

Jewels

35j

Frequency

36,000 bph

Power Reserve

51 hours

Year

1996

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