Vintage 1968 JAPAN SEIKO SEIKO BELL-MATIC CALENDAR 4005-7000 27Jewels Automatic.

Vintage 1968 JAPAN SEIKO SEIKO BELL-MATIC CALENDAR 4005-7000 27Jewels Automatic.

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

Item description

Movement :

• Pet name : SEIKO BELL-MATIC CALENDAR .
• Caliber No. : 4005A.
• Movement : Automatic.
• Beat rate : 19800bph.
• Year of manufacture start : 1967's.
• Factory : Suwa.

Externals :

• Serial No. : 864287.
• Dial No. : JAPAN 4005-7000T AD.
• Glass : Acrylic.
• Case size : About 36.8mm.
• Lug width : 19mm.
• 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 Rare Sovereign Pinnacle of Early Mechanical Alarms (1968): Manufactured in 1968—a monumental year during Japan's peak mechanical watchmaking era—the Seiko Bell-Matic Calendar reference 4005-7000 represents the rare, ultra-desirable single-date flagship variant of Seiko's mechanical alarm series. Produced by Suwa Seikosha, the short-lived 4005 caliber series was made for only a brief period before being superseded by the day-date 4006 line, making it one of the most coveted Bell-Matic references among vintage horological purists.
• The Over-Engineered 27-Jewel Caliber 4005 Automatic Alarm Movement: Powering this rare mechanical marvel is the top-tier 27-jewel Caliber 4005A, an in-house automatic engine operating at 18,000 vibrations per hour (vph). Boasting the highest jewel count ever offered in the Bell-Matic family, its lavish 27-jewel specification ensures buttery-smooth rotor winding and minimal pivot friction. It integrates a fully mechanical hammer-and-gong alarm mechanism paired with a quick-set date calendar.
• Distinctive Two-Function Crown and Alarm Pusher Architecture: Engineered with incredible mid-century mechanical ingenuity, the 4005-7000 features a two-stage crown and a dedicated alarm control pusher at 2 o'clock. The wearer rotates the internal alarm bezel via the pulled crown to set the desired ring time, winds the separate alarm spring, and pulls the 2 o'clock pusher outward to arm the mechanical chime.
• Architectural ""7000"" Stainless Steel Case and Rotating Inner Ring: Sourced in a solid stainless steel case, the reference 7000 case architecture features sweeping, multifaceted lugs and polished surfaces inspired by early ""Grammar of Design"" principles. Framing a radiant sunburst dial, the central rotating alarm indicator bezel is anchored by hand-applied hour markers, sharp hands, and a framed date window at 3 o'clock.
• An Investment-Grade Grail of Suwa's Alarm Heritage: Due to its extremely limited production run in 1968 and its elite 27-jewel movement configuration, the 4005-7000 Bell-Matic Calendar stands as an absolute grail reference for serious Seiko collectors worldwide. Combining executive mechanical complexity with daily alarm utility, it remains an irreplaceable piece of Japanese watchmaking history.

For more information, please look at the pictures.

Notes

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