Seiko King Seiko – Parts List Guide
(General Overview for Vintage King Seiko Models: 44KS, 45KS, 52KS, etc.)

King Seiko was Seiko’s premium line of mechanical watches that rivaled Grand Seiko during the 1960s and 1970s. Made primarily by Daini Seikosha (Seiko's subsidiary), these timepieces are admired today for their high-beat movements, sharp case designs, and fine finishing. Each model—such as the 44KS, 45KS, and 52KS—has slightly different parts depending on the movement and case style, but many components follow a consistent structure.

Below is a general King Seiko parts list covering the essential components found across various models:

Movement Components (e.g., Calibers 44A, 4502A, 5246A)

• Main Plate

• Barrel and Mainspring

• Center Wheel

• Third Wheel

• Fourth Wheel

• Escape Wheel

• Pallet Fork

• Balance Wheel Assembly (with hairspring)

• Balance Cock

• Shock Absorber (Diashock)

• Keyless Works (Stem, Setting Lever, Yoke, Clutch Wheel)

• Winding Pinion & Sliding Pinion

• Minute Wheel

• Setting Wheel

• Cannon Pinion

• Hour Wheel

• Calendar Mechanism (only in date models – quickset/date wheel, jumper, spring, etc.)

• Automatic Winding Rotor (only in automatic calibers like 5246)

• Ratchet Wheel

• Crown Wheel

• Click and Click Spring

• Regulator and Stud Holder

• Bridges (Train wheel, Barrel, Balance)

Exterior Case Parts

• Watch Case (varies by model – often stainless steel with sharp “Grammar of Design” edges)

• Case Back

  • Screw-down or Snap-on style, with “Shield” or “Medallion” emblem

• Crown

  • Often unsigned or marked with “W” (for water-resistant) or KS

• Crystal

  • Typically acrylic or Hardlex; some models used mineral

• Bezel (fixed, usually integrated into the case)

• Gaskets (Case back gasket, crown gasket, crystal gasket – for water resistance)

Dial & Hands

• Dial Plate

  • Varies: silver sunburst, champagne, or matte black; applied KS logo

• Hour, Minute, and Second Hands

  • Often dauphine or baton-style

• Dial Feet

• Indices (applied metal markers)

• Day/Date Windows (on calendar models)

• Luminous Plots or Inserts (on some models)

Bracelet and Strap Parts

• Original King Seiko Bracelet

  • Usually stainless steel with signed clasp, straight or folded links

• Spring Bars

  • Standard 18mm–20mm lug width depending on model

• End Links (Model-specific)

• Clasp (Signed “Seiko” or “KS” on vintage models)

Miscellaneous Parts

• Movement Holder Ring (for securing movement inside the case)

• Case Screws

• Stem Extension (on some models)

• Pushers or Buttons (only on some rare variants with additional complications)

Notes for Collectors and Watchmakers

• Many King Seiko parts are no longer in production. Sourcing them often requires buying donor movements or finding NOS (New Old Stock).

• Caliber-specific variations are important. For example, a part for the 4502A may not fit the 5246A.

• Ensure authenticity when replacing dials or hands—refinished parts can reduce value.

• Case backs with medallions are especially collectible. Replacement backs without medallions may reduce a watch's appeal.