Seiko Bell‑Matic 4006‑6021

Seiko Bell‑Matic 4006‑6021 – Fully Serviced Vintage Alarm Watch (1970s)

This vintage Seiko Bell-Matic 4006-6021 is a true collector's timepiece—an iconic mechanical alarm watch from the golden era of Japanese watchmaking. Produced in the early 1970s, this model combines functional ingenuity with a timeless design.

This particular piece was acquired from one of our valued clients and has since undergone a full professional service, ensuring it runs beautifully and reliably. Both aesthetically and mechanically, it stands in excellent condition, ready to be worn or cherished in any serious collection.

Technical Specifications – Seiko Bell‑Matic 4006‑6021

• Model: Seiko Bell‑Matic 4006‑6021

• Movement: Seiko Caliber 4006 automatic (mechanical with alarm)

• Jewels: 17 jewels

• Functions:

  • Hours, minutes, seconds

  • Quickset day and date

  • Mechanical alarm (bell-style)

• Alarm Control:

  • Set via upper crown

  • Activated with pusher at 2 o'clock

• Power Reserve: Approx. 40 hours

• Case Material: Stainless steel

• Case Diameter: 38–39 mm (excluding crowns)

• Case Thickness: Approx. 13 mm

• Lug-to-Lug: Approx. 43 mm

• Crystal: Domed acrylic (polished)

• Dial: Linen-textured silver/white (original)

• Markers: Applied baton indices

• Hands: Original luminous hands

• Alarm Ring: Inner rotating ring with red arrow pointer

• Strap: Leather strap (19 mm lug width)

• Water Resistance: Splash-resistant (gaskets replaced)

• Crown Functions:

  • Lower crown: Time + date setting

  • Upper crown: Alarm setting

  • Pusher: Activates alarm

• Condition:

  • Fully serviced

  • Accurate timekeeping

  • Functional alarm

  • Excellent cosmetic condition

• Production Period: Early 1970s (circa 1971–1974)

• Country of Manufacture: Japan