Seiko Cal. 5681 - 251

The 5681-251 is a sought-after Hand-Winding piece from Seiko's golden era. It features a Navy dial protected by a Hardlex crystal and offers 40m of water resistance. [seikata-wm-8974f5fdf87c]

Also known as: Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

15.0mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

40m

Dial Color

Navy

Jewels

23j

Frequency

21,600 bph

Power Reserve

72 hours

Year

1966

Related Models

• Seiko 4427-158
• Seiko 3821-235
• Seiko 6185-566
• Seiko 6335-399
• Seiko 5285-972
• Seiko 6215-804
• Seiko 6211-961
• Seiko 5262-258
• Seiko 5689-412
• Seiko 6397-774
• Seiko 6642-345
• Seiko 5683-268