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SEIKO BULLHEAD 6138-0040, AUTOMATIC, YEAR 1976
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| Brand | Seiko |
|---|---|
| Model | 6138-0040 Bullhead |
| Gender | Man |
| Decade | 1970s |
| Year of manufacture | 1976 |
| Serial number | 6D9402 |
| Case code | 0040 |
| Movement | Automatic |
| Caliber | Seiko 6138 |
| Crystal | Hardlex Seiko |
| Bezel | Aluminum, with tachymeter. |
| Case material | Steel |
| Diameter without crown | 43 mm |
| Diameter with crown | 44 mm |
| Lug-to-lug length | 47 mm |
| Thickness | 14 mm |
| Strap width | 20 mm |
| Strap material | Steel |
| Strap color | Steel |
| Closure/buckle | Drop-down clasp, signed SEIKO |
| Condition of the watch | Very good, with slight signs of aging. |
| Case/Box | Yes, generic. |
| Documentation | Free Certificate of Authenticity available on request |
Seiko’s history began in 1881 in Tokyo, Japan, when a young entrepreneur named Kintaro Hattori opened a watch repair and sales shop. His vision was to create high-quality watches, and in 1892 he founded the Seikosha factory (in Japanese, “Seiko” means “precision” or “success”, and “sha” means “house”). Initially, Seikosha produced wall clocks, but over time they focused on pocket and wristwatches production.
First Japanese wristwatch
In 1913, Seikosha launched the Laurel, the first wristwatch made in Japan. This marked a significant milestone, as Japan had no watchmaking tradition at that time. The company became a pioneer in its country and laid the foundation for what would become a benchmark name in the global watch industry.
Technological innovation and quartz watches
In 1969, Seiko revolutionized the watchmaking world with the Seiko Astron, the world’s first quartz wristwatch. This breakthrough transformed the watch industry by introducing a much more accurate and affordable technology than traditional mechanical movements. Quartz technology quickly became popular and remains a standard in modern watchmaking.
Precision and reliability
Over time, Seiko has introduced multiple watchmaking innovations, such as the automatic chronograph and the Kinetic charging system (a combination of kinetic energy and quartz technology). It is also known for its dive watches, highly valued for their durability and resistance in extreme conditions.
Seiko has earned a special place in the watch industry by combining tradition and technology at affordable prices, offering from simple models to high-end pieces with its Grand Seiko line.
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INFORMACIÓN
| Brand | Seiko |
|---|---|
| Model | SPORTS 150 CHRONOGRAPH |
| Gender | Man |
| Country of origin | Japan |
| Decade | 1990s |
| Year of manufacture | 1991 |
| Serial number | 102001 |
| Case code | 6A00 A6 |
| Movement | Quartz |
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| Crystal | Mineral |
| Dial | Black, with three subdials and calendar at 3 o'clock. |
| Bezel | Gold-plated with tachymeter. |
| Corona | Original, firmada Seiko |
| Case material | Gold-plated with 20 microns |
| Diameter without crown | 40.5 mm |
| Diameter with crown | 42.5 mm |
| Lug-to-lug length | 44.4 mm |
| Thickness | 11,5 mm |
| Strap width | 20 mm |
| Strap material | Gold-plated steel |
| Strap color | Gold |
| Closure/buckle | Pin type, original signed Seiko |
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| Documentation | Free Certificate of Authenticity available on request |
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INFORMACIÓN
| Brand | Seiko |
|---|---|
| Model | UFO 6138-0012 |
| Gender | Man |
| Country of origin | Japan |
| Decade | 1970s |
| Year of manufacture | 1977 |
| Serial number | 7N4078 |
| Case code | Attribute 0012 |
| Movement | Automatic |
| Caliber | Seiko 4R36 |
| Crystal | Original PLexiglás |
| Dial | Black, with two subdials and calendar at 3. |
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| Corona | Steel, original Seiko. |
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| Diameter without crown | 43.5 mm |
| Diameter with crown | 45 mm |
| Lug-to-lug length | 46 mm |
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| Strap width | 19 mm |
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| Condition of the watch | Very good, with slight signs of aging. |
| Case/Box | Yes, generic. |
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INFORMACIÓN
| Brand | Seiko |
|---|---|
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| Gender | Man |
| Country of origin | Japan |
| Decade | 1970s |
| Year of manufacture | 1975 |
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| Diameter without crown | 39 mm |
| Diameter with crown | 40.7 mm |
| Lug-to-lug length | 44.4 mm |
| Thickness | 12 mm |
| Strap width | 18 mm |
| Strap material | Stainless steel |
| Strap color | Steel |
| Closure/buckle | Steel, SEIKO signed clasp type |
| Condition of the watch | Excellent, like new! |
| Case/Box | Yes, generic. |
| Documentation | Free Certificate of Authenticity available on request |
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INFORMACIÓN
| Brand | Seiko |
|---|---|
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| Gender | Man |
| Country of origin | Japan |
| Decade | 1970s |
| Year of manufacture | 1972 |
| Serial number | 211321 |
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| Case material | Stainless steel |
| Diameter without crown | 37.2 mm |
| Diameter with crown | 37,2 mm |
| Lug-to-lug length | 40 mm |
| Thickness | 12 mm |
| Strap width | 19 mm |
| Strap material | Stainless steel |
| Strap color | Steel |
| Closure/buckle | Steel type clasp, original signed SEIKO. |
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SEIKO 5, 6119-8450 AUTOMATIC, VINTAGE YEAR 1971
INFORMACIÓN
| Brand | Seiko |
|---|---|
| Model | 6119-8450 |
| Gender | Man |
| Decade | 1970s |
| Year of manufacture | 1971 |
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| Case material | Stainless steel |
| Diameter without crown | 40 mm |
| Diameter with crown | 40 mm |
| Lug-to-lug length | 44 mm |
| Thickness | 12 mm |
| Strap width | 18 mm |
| Strap material | Stainless steel |
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INFORMACIÓN
| Brand | Seiko |
|---|---|
| Model | GMT 6117-6400 |
| Gender | Man |
| Decade | 1970s |
| Year of manufacture | 1971 |
| Serial number | 121360 |
| Case code | 6400 |
| Movement | Automatic |
| Caliber | Seiko 6117 |
| Crystal | Original PLexiglás |
| Bezel | Interior, datos mundiales |
| Case material | Steel |
| Diameter without crown | 40 mm |
| Diameter with crown | 41 mm |
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INFORMACIÓN
| Brand | Seiko |
|---|---|
| Model | 6134-2022 |
| Gender | Man |
| Decade | 1970s |
| Year of manufacture | 1972 |
| Serial number | 220523 |
| Case code | 2022 |
| Movement | Automatic |
| Crystal | Original PLexiglás |
| Dial | Black, with double date function at 3 o'clock. |
| Bezel | Interior con taquímetro |
| Corona | Original Seiko, de acero |
| Case material | Stainless steel |
| Diameter without crown | 40 mm |
| Diameter with crown | 41 mm |
| Lug-to-lug length | 46 mm |
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| Case/Box | Yes, generic. |
| Documentation | Free Certificate of Authenticity available on request |
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INFORMACIÓN
| Brand | Seiko |
|---|---|
| Model | Crono Flyback Speed Timer 7015-7000 |
| Gender | Man |
| Decade | 1970s |
| Year of manufacture | 1973 |
| Serial number | Serial Number: 361505 |
| Case code | 7000 |
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| Diameter with crown | 39 mm |
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| Documentation | Free Certificate of Authenticity available on request |



