Seiko Cal. 3820 - 720

The 3820-720 is a sought-after Quartz piece from Seiko's golden era. Powered by the 3820 caliber with 24j jewels beating at 21,600 bph, it delivers a 72 hours power reserve. [seikata-wm-9805572cc61a]

Also known as: Bellmatic, Arnie

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

40mm

Case Thickness

9.9mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Silver

Jewels

24j

Frequency

21,600 bph

Power Reserve

72 hours

Year

1971

Related Models

• Seiko 3867-807
• Seiko 7036-431
• Seiko 5296-369
• Seiko 7177-613
• Seiko 4429-738
• Seiko 0748-646
• Seiko 3887-535
• Seiko 7188-773
• Seiko 6143-707
• Seiko 7140-862
• Seiko 4470-535
• Seiko 0715-247