Seiko Cal. 4550 - 390

The 4550-390 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 4550 caliber with 26j jewels beating at 21,600 bph, it delivers a 66 hours power reserve. [seikata-wm-30f0ca06afed]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

34mm

Case Thickness

12.2mm

Lug Width

20mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

Silver

Jewels

26j

Frequency

21,600 bph

Power Reserve

66 hours

Year

1998

Related Models

• Seiko 7096-446
• Seiko 0763-674
• Seiko 4476-181
• Seiko 6612-922
• Seiko 6230-340
• Seiko 5225-398
• Seiko 7150-970
• Seiko 3883-659
• Seiko 4421-151
• Seiko 6199-379
• Seiko 6285-956
• Seiko 6143-649