Seiko Cal. 4421 - 407

The Seiko 4421-407 represents an important milestone in Seiko's 1978 lineup. It features a Navy dial protected by a Mineral crystal and offers 180m of water resistance. [seikata-wm-84d8e8e9ac7f]

Also known as: Sumo, Bellmatic

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

14.2mm

Lug Width

20mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

Navy

Jewels

24j

Frequency

36,000 bph

Power Reserve

53 hours

Year

1978

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