Seiko Cal. 3820 - 645

The Seiko 3820-645 represents an important milestone in Seiko's 1978 lineup. Powered by the 3820 caliber with 30j jewels beating at 21,600 bph, it delivers a 47 hours power reserve. [seikata-wm-0dde5abb362c]

Also known as: Rally, Baby Tuna

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

44mm

Case Thickness

11.7mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

170m

Dial Color

Cream

Jewels

30j

Frequency

21,600 bph

Power Reserve

47 hours

Year

1978

Related Models

• Seiko 0762-925
• Seiko 0755-979
• Seiko 6230-557
• Seiko 6330-318
• Seiko 6218-915
• Seiko 6236-169
• Seiko 6147-998
• Seiko 4499-936
• Seiko 6226-847
• Seiko 5658-702
• Seiko 5279-120
• Seiko 6241-462