Seiko Cal. 4421 - 643

The 4421-643 is a sought-after Quartz piece from Seiko's golden era. It features a Navy dial protected by a Mineral crystal and offers 90m of water resistance. [seikata-wm-ded9217a99cc]

Also known as: Tuna

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

46mm

Case Thickness

15.9mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Navy

Jewels

30j

Frequency

21,600 bph

Power Reserve

50 hours

Year

1983

Related Models

• Seiko 4523-698
• Seiko 4558-402
• Seiko 4541-172
• Seiko 7174-980
• Seiko 4446-742
• Seiko 5653-452
• Seiko 0739-113
• Seiko 6396-397
• Seiko 6234-519
• Seiko 5256-265
• Seiko 7142-204
• Seiko 4551-219