Seiko Cal. 5644 - 181

This Hand-Winding model from 1969 features a 36mm Titanium case. The Inner Rotating bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-18461a0f0c2e]

Also known as: Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

36mm

Case Thickness

10.5mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

White

Jewels

28j

Frequency

28,800 bph

Power Reserve

44 hours

Year

1969

Related Models

• Seiko 6362-344
• Seiko 6133-675
• Seiko 3842-739
• Seiko 7196-579
• Seiko 6380-780
• Seiko 7185-396
• Seiko 4453-820
• Seiko 7085-350
• Seiko 3826-657
• Seiko 4545-986
• Seiko 6239-564
• Seiko 6262-347