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 : 889924.
• Dial number : JAPAN 4006-7070T AD.
• Glass : Acrylic.
• Case size : About 38.37mm.
• Lug width : 18mm.
• Band : New Leather Strap of SEIKO original.

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 milestone year during Japan's mid-Showa industrial boom—the **Seiko Bell-Matic Weekdater** represented Suwa Seikosha's ultimate mechanical marvel for high-society executives. Sourced under reference **4006-7000**, this flagship mechanical alarm instrument allowed global travelers and business leaders to set precise audio reminders, serving as an authoritative status symbol of modern Japanese horological ingenuity.

The Ultra-Rare 27-Jewel Caliber 4006 Automatic Heart: Powering this historic timepiece is the highly coveted **27-jewel Caliber 4006A**, an in-house automatic engine operating at a classic frequency of **19,800 vibrations per hour (vph)**. Equipping an automatic alarm watch in **1968** with a lavish **27-jewel specification** was a monumental statement of micro-engineering prowess (shortly before tariff restrictions reduced later export versions to 17 jewels). It features a dedicated alarm spring barrel wound manually via the primary crown.

Integrated Mechanical Alarm Ring and Inner Bezel Geometry: A defining technological triumph of the 4006 movement is its crisp, audible mechanical alarm. Operated via the 2 o'clock crown-pusher (which arms/disarms the hammer mechanism), the wearer turns the crown in position zero to position the internal **rotating alarm bezel cursor** to the desired hour. When triggered, a dedicated internal striker hits a tuned steel sound-post, producing a distinctive, energetic ringing buzz.

Architectural ""7000"" Cushion Case and Dial Balance: The reference **4006-7000** is globally distinguished among vintage collectors for its robust, broad-shouldered **cushion case architecture** featuring sweeping polished contours inspired by Taro Tanaka's **""Grammar of Design""** guidelines. The radiant silver sunburst dial showcases **hand-applied, multifaceted hour indices** and sharp hands. Symmetrically framed at 3 o'clock, the dual-calendar window houses a **bilingual day disk** alongside a quick-set date function operated by depressing the 2 o'clock pusher.

An Investment-Grade Treasure of Suwa's Mechanical Legacy: Manufactured in the milestone mechanical year of **1968**, the early-production 27-jewel 4006-7000 Bell-Matic remains one of the rarest, most historically significant wrist-alarm references produced by Seiko. It captures the exact historical moment where Suwa Seikosha mastered complex horological complications right before the quartz era. Built to an uncompromising heirloom standard, it stands as an eternal testament to mid-century mechanical design.

For more information, please look at the pictures.

Notes

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