Seiko Cal. 3840 - 365

The 3840-365 is a sought-after Automatic piece from Seiko's golden era. Powered by the 3840 caliber with 30j jewels beating at 28,800 bph, it delivers a 64 hours power reserve. [seikata-wm-2aa29db49715]

Also known as: Helmet, Bellmatic

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

42mm

Case Thickness

14.5mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Black

Jewels

30j

Frequency

28,800 bph

Power Reserve

64 hours

Year

1965

Related Models

• Seiko 4551-323
• Seiko 3831-331
• Seiko 4410-899
• Seiko 6252-291
• Seiko 6626-620
• Seiko 6658-847
• Seiko 6389-854
• Seiko 0740-465
• Seiko 6195-130
• Seiko 0726-337
• Seiko 6176-765
• Seiko 3837-959