Seiko Cal. 4421 - 678

Released in 1978, the Cal. 4421 with design code 678 was part of Seiko's domestic market collection. Powered by the 4421 caliber with 21j jewels beating at 28,800 bph, it delivers a 66 hours power reserve. [seikata-wm-2310dc3cefa3]

Also known as: Silverwave

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

44mm

Case Thickness

12.8mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Silver

Jewels

21j

Frequency

28,800 bph

Power Reserve

66 hours

Year

1978

Related Models

• Seiko 6631-244
• Seiko 4469-941
• Seiko 6238-661
• Seiko 6180-655
• Seiko 5297-576
• Seiko 0728-696
• Seiko 6688-386
• Seiko 4593-717
• Seiko 4410-430
• Seiko 4441-491
• Seiko 7049-546
• Seiko 4523-293