Vintage 1975 JAPAN SEIKO BELL-MATIC WEEKDATER 4006-7012 27Jewels Automatic.

Vintage 1975 JAPAN SEIKO BELL-MATIC WEEKDATER 4006-7012 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 No. : 4006A.
• Movement : Automatic.
• Beat rate : 19800bph.
• Year of manufacture start : 1967's.
• Factory : Suwa.

Externals :

• Serial No. : 530226.
• Dial No. JAPAN 4006-7011T.
• Glass : Acrylic.
• Case size : About 38.4mm.
• Lug width : 19mm.
• Band : Wrist size that can be worn is Up to about 188mm.

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 Mid-70s Mechanical Alarm Luxury (1975): Manufactured in 1975—a pivotal historical year during Japan's mature post-war economic boom and the twilight of the golden mechanical era—the Seiko Bell-Matic Weekdater reference 4006-7012 represented Suwa Seikosha's premier multi-complication executive wrist instrument. Blending daily dual-calendar functionality with an intricate mechanical alarm mechanism, this flagship model stood as a triumph of Showa-era micro-engineering.
• The Over-Engineered 27-Jewel Caliber 4006 Automatic Engine: Powering this complex timepiece is the top-tier 27-jewel Caliber 4006A, an in-house automatic engine operating at 18,000 vibrations per hour (vph). Featuring the highest jewel count offered in the 4006 series, its lavish 27-jewel specification utilizes synthetic rubies across critical gear pivots to drastically reduce wear. It combines smooth rotor winding, a quick-set date calendar, and a fully mechanical internal hammer-and-gong alarm assembly.
• Distinctive Two-Function Crown and Mechanical Alarm Architecture: Engineered for effortless executive utility, the 4006-7012 features a two-stage crown paired with a dedicated alarm control pusher at 2 o'clock. The wearer sets the internal alarm indicator ring via the crown, winds the dedicated alarm mainspring, and pulls the 2 o'clock pusher outward to arm the crisp, mechanical chiming alarm when the designated hour arrives.
• Architectural ""7012"" Grammar of Design Stainless Steel Case: Executed in solid stainless steel, the reference 7012 case geometry displays sharp angular facets, broad sweeping lugs, and zero-distortion mirror-polished Zaratsu surfaces inspired by Taro Tanaka's ""Grammar of Design"" principles. The robust case houses an inner rotating alarm bezel surrounding a radiant silver sunburst dial, complete with hand-applied, multifaceted rectangular block indices and a framed day-date display at 3 o'clock.
• An Investment-Grade Masterpiece of Suwa's Complication Heritage: Produced during the milestone mechanical year of 1975, the 4006-7012 27-jewel Bell-Matic Weekdater remains an exceptionally desirable, highly collectible cornerstone reference for serious vintage Seiko enthusiasts worldwide. Capturing the precise era where Suwa Seikosha perfected complex mechanical daily instruments right before the full expansion of digital quartz technology, it stands as an eternal, heirloom-quality testament to Japanese horological innovation.

For more information, please look at the pictures.

Notes

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