Seiko Cal. 4550 - 581

Released in 1971, the Cal. 4550 with design code 581 was part of Seiko's domestic market collection. Powered by the 4550 caliber with 25j jewels beating at 21,600 bph, it delivers a 37 hours power reserve. [seikata-wm-25c757fa30da]

Also known as: World Timer, Golden Tuna

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

37mm

Case Thickness

8.0mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

190m

Dial Color

Silver

Jewels

25j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1971

Related Models

• Seiko 7018-252
• Seiko 6370-722
• Seiko 0729-543
• Seiko 5228-732
• Seiko 6145-856
• Seiko 4445-230
• Seiko 6289-880
• Seiko 0778-145
• Seiko 5243-943
• Seiko 0767-340
• Seiko 6218-350
• Seiko 3819-734