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Information about the various movements

The availability of mechanical movements and their prices are subject to considerable fluctuations. Waiting periods of up to eighteen months and price increases of up to one hundred percent within one year are not uncommon. This is why MARC & SONS uses mechanical movements from different manufacturers to react more flexibly to changes in the market and to always offer its customers the best price-performance ratio. MARC & SONS attaches great importance to quality and reliability when selecting watch movements. For these reasons, exclusively mechanical quality movements from the world-famous manufacturers MIYOTA, SEIKO and ETA are used.

Our MIYOTA movements

On the history of the watchmaker MIYOTA

The company MIYOTA was founded in 1959 by the Japanese watch manufacturer Citizen. The task of the factory, which is located in the Japanese Alps, is the production of movements. Today, MIYOTA is a 65 percent subsidiary of the Citizen Watch Co, the world's largest watch and watch manufacturer. The movements of MIYOTA, produced in the homonymous city of Miyota, in the Nagano Prefecture and in Kitakami, enjoy an excellent reputation in professional circles and are considered highly reliable.


MIYOTA - caliber 8215

The caliber 8215, which has been produced since 1977, is one of Miyota's most popular mechanical movements. In addition to a central second, this plant also has a quick-change circuit for the date, a Parashoc shock protection and a Swiss anchor inhibitor. The range deviation is indicated as -20 to + 40 seconds per day. According to experience, however, the movement runs much more precisely, in some cases with a deviation in the single-digit second range. The reserve is 42 hours.

Technical specifications:

Functions: hour, minute, central seconds, date
Lines: 11½
Height: 5.67 mm
Overall diameter: 26.0 mm
Case Diameter: 25.6 mm
Storage: 21 jewels
Frequency: 21,600 A / h
Power reserve: 42 hours
Gauge deflection: -20 to + 40 seconds per day

 

MIYOTA - caliber 8217

The caliber 8217 from MIYOTA has the same technical data as the caliber 8215. In addition, the movement is equipped with a 24 hour display, which is at the 9:00 o'clock position. Just like the caliber 8215, the 8217 caliber impresses with its reliable operation.

Technical specifications:

Functions: hour, minute, central seconds, date, 24h display
Lines: 11½
Height: 5.67 mm
Overall diameter: 26.0 mm
Case diameter: 25.6 mm
Storage: 21 jewels
Frequency: 21,600 A / h
Power reserve: 42 hours
Gauge deflection: -20 to + 40 seconds per day

 

MIYOTA - caliber 9015

The caliber 9015, which was presented for the first time in 2009, is a revolutionary development of the 8215 caliber. Equipped with a ball bearing rotor, a second stop and a date with a quick-change circuit, this new plant works very precisely with 28,800 half oscillations per hour. The range deviation is indicated as -10 to +30 seconds per day. According to experience, however, the work runs much more precisely, in some cases with a deviation in the single-digit second range. Furthermore, the movement has a shock absorber, a Swiss anchor suspension and a hand lift. The reserve is 42 hours. The movement is a technical masterpiece due to its low overall height of only 3.9 mm.

Technical specifications:

Functions: hour, minute, central seconds, date
Lines: 11½
Height: 3,90 mm
Overall diameter: 26.0 mm
Case diameter: 25.6 mm
Storage: 24 jewels
Frequency: 28,800 A / h
Reserve: 42 hours
Gauge deflection: -10 to +30 seconds per day

 

MIYOTA - Caliber 9100

The Caliber 9100 is a high-quality mechanical multifunctional watch from the MIYOTA 9000 series and has been produced since 2009. In addition to the Caliber 9015, the watch features a gear reserve indicator, a 24-hour display and a weekday display. The plant operates at 28,800 half-cycles per hour and offers a reserve of 42 hours. An anti-theft device and the miyotatypical date rapid switching are also part of the basic equipment, as well as the manual lift and the second stop.

Technical specifications:

Functions: hour, minute, second, date, weekday display, 24 hour display, power reserve indicator
Lines: 13½
Height: 5.52 mm
Total diameter: 30.2 mm
Case diameter: 25.6 mm
Storage: 26 jewels
Frequency: 28,800 A / h
Power reserve: 42 hours
Gauge deflection: -10 to +30 seconds per day

 

Our SEIKO watch movements

On the history of the watch movement manufacturer TMI Time Module

TMI was founded in 1987 by Seiko Corporation, Seiko Instruments Inc. and Seiko Epson Corporation, with the aim of manufacturing watch movements. Time Module (H.K.) Ltd. Is the world's leading manufacturer of watches. The watch movements are manufactured according to very strict quality standards. All production lines are certified according to ISO 9001 and ISO 14001 and are recognized by the international certification body.

Seiko - caliber NH35

The caliber NH35 is a robust and very reliable mechanical movement, which works on the basis of the legendary Seiko 7S26 caliber. It has a hand lift and a second stop. The range deviation is indicated as -20 to + 40 seconds per day. According to experience, however, the movement runs much more precisely, in some cases with a deviation in the single-digit second range. Furthermore, the plant has a date-short-circuit. The reserve is 41 hours.

Technical specifications:

Functions: hour, minute, central seconds, date
Height 5,32 mm
Overall diameter: 27.40 mm
Case diameter: 29.36 mm
Frequency: 21,600 A / h
Storage: 24 jewels
Gauge deflection: -20 to + 40 seconds per day
Power reserve: 41 hours

 

Our ETA movements

On the history of ETA SA Manufacture Horlogère Suisse

The company ETA SA Manufacture Horlogère Suisse, whose origins date back to 1793, is a Swiss manufacturer of watches and clock movements and belongs to the Swatch Group. More than 8,000 employees work at eleven production sites. The company is located in Grenchen, Switzerland


ETA caliber 2824-2

The history of the ETA caliber 2824 dates back to 1971, when the first version of this legendary watch was presented. Since 1982 the version ETA 2824-2 has been produced and installed millions of times. The caliber has a ball-bearing central rotor that winds in both directions and an automatic elevator. Furthermore, the clockwork is equipped with a seconds stop, an Incabloc shock absorber, a Swiss anchor suspension, a date quick connection and the ETACHRON rear system. The movement is considered to be robust and is known for its precise and reliable operation.

Technical specifications:

Functions: hour, minute, central seconds, date
Lines 11½
Height: 4.60 mm
Overall diameter: 25,60 mm
Frequency: 28,800 A / h
Storage: 25 jewels
Power reserve: 38-40 hours


ETA caliber 2893-2

The 2893-2 is a mechanical movement with automatic winding, a second stop and a second time zone with a 24 hour hand. The plant is equipped with an Incabloc shock absorber, a Steinanker escapement, as well as the ETACHRON rear suspension system. The movement is very popular with pilots because of its GMT function.

Technical specifications:

Functions: hour, minute, central second, date, second time zone
Lines: 11½
Height: 4.10 mm
Overall diameter: 25,60 mm
Frequency: 28,800 A / h
Storage: 21 jewels
Power reserve: 42 hours


ETA caliber 7750

The ETA caliber ETA 7750, also known as Valjoux 7750, is probably the most successful automatic chronograph movement ever. Since 1973 it has been produced and constantly developed. The plant is equipped with a single-sided rotor, which is ball-bearing. The factory works with 28,800 half-oscillations per hour and has a reserve of about 44 hours. The movement features a Glucydur balance, a Nivaflex tension spring and an Incabloc shock protection. Furthermore, the movement is equipped with the ETACHRON feedback system and the retractor as well as a second stop. The operation is performed by two pushers, the chronograph mechanism works with cams.

Technical specifications:

Functions: hour, minute, small second, date, weekday display,
Chronograph with 30-minute counter, 12-hour counter and central stop-seconds indicator
Lines: 13 ¼
Height: 7.90 mm
Diameter 30.0 mm
Storage: 25 jewels
Frequency: 28,800 A / h
Course reserve: approx. 44 hours

 

Japanese or Swiss movement - Which one is better?

To be able to answer this question, we must compare the movements. The ETA 2824-2, the MIYOTA calibres 8215, 8217 and 9015 as well as the Seiko caliber NH35 are all reliable working mechanical clocks with date. They have been produced for years and are used in numerous watches of world famous brands. Swiss ETA plants are mainly installed in the watches of the mother company Swatch Group. These include, inter alia, Brands such as Longines, Omega, Certina, Rado or Tissot and Hamilton. Japanese movements can be found in watches of Seiko, Citizen, There are several factors that influence the value of a work, its reliability, and its behavior.


1. Vibrations per hour

In principle, it can be said that the behavior of a mechanical movements improves with the increase in the number of vibrations. A value of 18,000 vibrations per hour was the standard for decades, and many new movements still work with this vibration figure. All of the watches built by us run with higher vibration numbers, either with 21.600 or 28.800. The vibrations of a Japanese plant (for example MIYOTA caliber 9015) and a Swiss factory (e.g., ETA 2824-2) are the same. The course of the movements is the same.


2. Stones

As a stone, also called jewel or ruby, is a bearing made of a precious stone within the complex movement. The stones, which were already developed in 1704 by a Swiss mathematician, are now mostly produced synthetically. They are subdivided into storage bricks and deck stones. The purpose of the stones is to reduce friction and wear on moving parts. Simple mechanical movements work with five to seven stones. In the course of time, however, seventeen stones have established themselves as a standard. All of our watch movements, whether from Japanese or Swiss production, have much more stones. However, more than 25 stones are generally not necessary and are therefore not an additional quality feature. Rather, these additional stones serve the aesthetics and decoration in the luxury watch segment.


3. Power reserve

As a Power reserve, often referred to as the "running time", the time in which a mechanical movement runs correctly with maximum applied spring without external influence such as winding up or moving to its standstill. In this comparative criterion, the Japanese and Swiss plants with values ​​over forty hours are also in the same range.


In summary, it can be said that the technical data of the Japanese and Swiss movements installed by us are nearly identical. A date quickshift is just as standard as an impact protection. There are small differences in the finish. The surface refinement is better at the Swiss plants by nuances. Some Swiss watches are offered with gilded parts. This, however, has no influence on the quality or the behavior of the movement and is usually hidden invisibly under the steel watch base, at least as far as diving watches are concerned. As far as quality and reliability are concerned, Japanese movements are hardly able to meet the needs of the Swiss factory and thus form an inexpensive alternative for our customers.

 

 

 

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