Seiko Cal. 6646 - 221

The 6646-221 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6646 caliber with 22j jewels beating at 28,800 bph, it delivers a 53 hours power reserve. [seikata-wm-1b06a9a87cc6]

Also known as: Bullhead, World Timer

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

35mm

Case Thickness

15.2mm

Lug Width

21mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

150m

Dial Color

Silver

Jewels

22j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1965

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