Seiko Cal. 3816 - 647

The 3816-647 is a sought-after Automatic piece from Seiko's golden era. With its 21mm lug width and 14.2mm profile, it sits comfortably on most wrists. [seikata-wm-b03ed5ce7d45]

Also known as: Bullhead, Helmet

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

35mm

Case Thickness

14.2mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

200m

Dial Color

Cream

Jewels

19j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1968

Related Models

• Seiko 5214-829
• Seiko 7110-449
• Seiko 7187-905
• Seiko 7020-808
• Seiko 6687-801
• Seiko 6665-855
• Seiko 0777-120
• Seiko 6250-981
• Seiko 6344-440
• Seiko 5627-958
• Seiko 4516-372
• Seiko 7110-343