Seiko Cal. 3857 - 720

Released in 1966, the Cal. 3857 with design code 720 was part of Seiko's domestic market collection. It features a Blue Sunburst dial protected by a Acrylic crystal and offers 40m of water resistance. [seikata-wm-24d098d198a3]

Also known as: Monster

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

34mm

Case Thickness

10.9mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Blue Sunburst

Jewels

21j

Frequency

28,800 bph

Power Reserve

59 hours

Year

1966

Related Models

• Seiko 6131-140
• Seiko 4545-152
• Seiko 0797-398
• Seiko 3880-429
• Seiko 6395-531
• Seiko 4453-824
• Seiko 6658-629
• Seiko 6666-502
• Seiko 5285-869
• Seiko 6212-482
• Seiko 7019-772
• Seiko 7072-513