Seiko Cal. 5661 - 101

The 5661-101 is a sought-after Kinetic piece from Seiko's golden era. The Bidirectional bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-42dd15976df8]

Also known as: Helmet, UFO

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

36mm

Case Thickness

14.5mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

160m

Dial Color

Silver

Jewels

26j

Frequency

36,000 bph

Power Reserve

66 hours

Year

1975

Related Models

• Seiko 4441-436
• Seiko 6254-406
• Seiko 4548-866
• Seiko 7116-610
• Seiko 5652-395
• Seiko 5220-980
• Seiko 0740-860
• Seiko 4490-176
• Seiko 6175-978
• Seiko 7146-944
• Seiko 4590-833
• Seiko 5211-745