Seiko Cal. 4521 - 731

The 4521-731 is a sought-after Hand-Winding piece from Seiko's golden era. With its 19mm lug width and 9.2mm profile, it sits comfortably on most wrists. [seikata-wm-2619da069cd5]

Also known as: Rally, Navigator

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

44mm

Case Thickness

9.2mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

120m

Dial Color

Blue Sunburst

Jewels

19j

Frequency

21,600 bph

Power Reserve

64 hours

Year

1975

Related Models

• Seiko 6632-761
• Seiko 5616-462
• Seiko 5619-860
• Seiko 4556-473
• Seiko 4470-396
• Seiko 6231-458
• Seiko 7178-199
• Seiko 6379-757
• Seiko 7038-744
• Seiko 7124-372
• Seiko 6256-878
• Seiko 5237-822