Seiko Cal. 4491 - 197

The 4491-197 is a sought-after Spring Drive piece from Seiko's golden era. With its 20mm lug width and 15.7mm profile, it sits comfortably on most wrists. [seikata-wm-d1e2bad215bc]

Also known as: Sumo, Helmet

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

43mm

Case Thickness

15.7mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Green

Jewels

36j

Frequency

36,000 bph

Power Reserve

36 hours

Year

1971

Related Models

• Seiko 5251-871
• Seiko 4420-127
• Seiko 6239-311
• Seiko 7113-385
• Seiko 4593-943
• Seiko 6658-230
• Seiko 6351-859
• Seiko 3870-826
• Seiko 6387-349
• Seiko 4462-877
• Seiko 5651-258
• Seiko 5679-657