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Seiko 5
BrandSeiko
Model5
Introduced1963
MovementAutomatic
ProductionIn production

The Seiko 5 is Seiko's entry-level automatic line, launched in 1963 and built to five defining traits set out at launch: automatic winding, a day-and-date display in a single window, water resistance, a recessed crown, and a durable case and bracelet. (Creation Watches) It has run continuously since across dozens of movement and case generations and become a byword in casual horology for reliable, inexpensive mechanical timekeeping.

Specialist watch-history blogger 石版的钟表工作 identifies a Seiko 5 on Lam Ka-tung's "Big B" in Infernal Affairs, arguing that the line's unglamorous, entry-level reputation suits a minor character whose limited screen time belies his role in the plot's climactic reversal. No reference or specific execution is given, and no second source corroborates the sighting. (石版的钟表工作; mirrored at Zhihu)

Appearances

1 cataloged appearance
Title Year Type Actor Character
Infernal Affairs (2002) 2002 Film Lam Ka-tung Big B