Seiko Cal. 3828 - 521

The Seiko 3828-521 represents an important milestone in Seiko's 1975 lineup. With its 20mm lug width and 10.5mm profile, it sits comfortably on most wrists. [seikata-wm-2ca6facde08d]

Also known as: Sumo, Navigator

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

34mm

Case Thickness

10.5mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Green

Jewels

25j

Frequency

36,000 bph

Power Reserve

58 hours

Year

1975

Related Models

• Seiko 6273-439
• Seiko 3850-446
• Seiko 4476-315
• Seiko 6298-506
• Seiko 7151-917
• Seiko 7038-900
• Seiko 4496-786
• Seiko 3858-202
• Seiko 0725-211
• Seiko 4473-491
• Seiko 7149-292
• Seiko 6365-725