Vintage 1968 JAPAN SEIKO BELL-MATIC WEEKDATER 4006-7000 27Jewels Automatic.

Vintage 1968 JAPAN SEIKO BELL-MATIC WEEKDATER 4006-7000 27Jewels Automatic.

Welcome to my auction!
I am Japanese who live in Tokyo.

Item description

Movement :

• Pet name : SEIKO BELL-MATIC WEEKDATER BUSINESS BELL .
• Caliber number : 4006A.
• Movement : Automatic.
• Beat rate : 19800bph.
• Year of manufacture start : 1967's.
• Factory : Suwa.

Externals :

• Serial number : 892174.
• Dial number : JAPAN 4006-7070T AD.
• Glass : Acrylic.
• Case size : About 38.47mm.
• Lug width : 18mm.
• Band : New Leather Strap.

Condition :

• Used, it runs well.
• Quick set(Day/Date) : Okay.
  Set of the days of the week : Iteration the hour hand at 10:00 and 1:00
  Set of the date: Press the button near the 3:00 position.
  Internal bezel Set : The set at one stage pulling the crown.
  Bell Set:Pull the button near the 3:00 position.
  Crown/pushers: Excellent Condition.
• The day difference time of an used watch is about +-1 minute / day.
• For practical, everyday use, it would be advisable to have the movement cleaned and oiled.

Key Features

The Sovereign Peak of 1968 Mechanical Alarm Innovation (1968): Manufactured in **1968**—a historic golden year for Suwa Seikosha’s mechanical breakthroughs—the **Seiko Bell-Matic Weekdater** reference **4006-7000** represented the apex of functional executive watchmaking. As Seiko's premier fully mechanical wrist-alarm timepiece, this 27-jewel reference delivered cutting-edge acoustic engineering paired with bold, late-1960s Showa-era styling.

The Over-Engineered 27-Jewel Caliber 4006A Automatic Heart: Powering this complex masterpiece is the high-grade **27-jewel Caliber 4006A**, an in-house automatic engine operating at **19,800 vibrations per hour (vph)**. Equipping an alarm wristwatch in **1968** with an ultra-high **27-jewel specification** was a statement of pure mechanical luxury. The movement features an integrated mechanical alarm driven by its own dedicated spring barrel, a central alarm-setting inner bezel ring, and a quick-set date function via the upper alarm pusher at 2 o'clock.

Architectural ""7000"" Cushion Case and Integrated Pusher Profile: Sourced in a solid stainless steel case, the reference **4006-7000** is globally distinguished for its muscular, broad-shouldered cushion geometry. Featuring sharp faceted lugs and broad polished bevels inspired by Taro Tanaka's **""Grammar of Design""** philosophy, the case seamlessly integrates the primary crown at 3 o'clock alongside the multi-function alarm activator/date pusher at 2 o'clock.

Masterful Dial Symmetry and Inner Rotating Alarm Ring: The dial of the **4006-7000** showcases extraordinary visual complexity maintained with clinical balance. A radiant silver sunburst canvas is framed by a **rotatable inner bezel ring** featuring a distinctive red/orange pointer to set the exact mechanical alarm time. It is decorated with **hand-applied, multifaceted hour indices** and houses a **bilingual day disk** and date window framed at 3 o'clock, proudly signed **""27 JEWELS""** above 6 o'clock.

An Investment-Grade Milestone of Mechanical Sound Design: As the flagship 27-jewel iteration from the inaugural production era of the 4006 series, the 1968 Bell-Matic 4006-7000 remains one of the most sought-after mechanical complications in Seiko's historical catalog. Its striking ringing/buzzing chime and robust construction make it an indispensable, investment-grade cornerstone reference for serious vintage watch collectors.

For more information, please look at the pictures.

Notes

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