Seiko Cal. 4550 - 621

The 4550-621 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 4550 caliber with 32j jewels beating at 21,600 bph, it delivers a 38 hours power reserve. [seikata-wm-13bac03ed7c0]

Also known as: Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

36mm

Case Thickness

8.5mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Black

Jewels

32j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1982

Related Models

• Seiko 6312-556
• Seiko 6293-755
• Seiko 6192-401
• Seiko 6217-199
• Seiko 0764-583
• Seiko 3838-306
• Seiko 3823-743
• Seiko 4535-677
• Seiko 5688-223
• Seiko 7194-686
• Seiko 6399-459
• Seiko 6112-539