Seiko Cal. 3840 - 663

Released in 1973, the Cal. 3840 with design code 663 was part of Seiko's domestic market collection. It features a Black dial protected by a Mineral crystal and offers 200m of water resistance. [seikata-wm-a875ced605a3]

Also known as: UFO

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

44mm

Case Thickness

11.8mm

Lug Width

22mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

200m

Dial Color

Black

Jewels

34j

Frequency

21,600 bph

Power Reserve

58 hours

Year

1973

Related Models

• Seiko 4451-397
• Seiko 4557-107
• Seiko 4494-515
• Seiko 6346-373
• Seiko 3844-257
• Seiko 6253-995
• Seiko 5273-325
• Seiko 6324-146
• Seiko 4538-381
• Seiko 5658-366
• Seiko 5229-818
• Seiko 4541-124