Seiko Cal. 4421 - 507

The 4421-507 is a sought-after Spring Drive piece from Seiko's golden era. With its 18mm lug width and 11.2mm profile, it sits comfortably on most wrists. [seikata-wm-7ddc76040ea9]

Also known as: Bullhead, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

39mm

Case Thickness

11.2mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

Navy

Jewels

20j

Frequency

28,800 bph

Power Reserve

57 hours

Year

1973

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