For Watchmaker: Watchmaker tool, Watchtools and watchwinder (watch tools and watch winder)

WELTMARKEN
  Rolex
  Carl F. Bucherer
  Chopard
  Piaget
  Audemars Piguet
  IWC
  Girard Perregaux
  Officine Panerai
  Baume & Mercier
  TAG Heuer
   Linien
   TAG Heuer Homepage
  Gucci
  Rado
  Swatch
 UHRENSERVICE
 

The Valjoux 7750 Overhaul.
The Valjoux 7750 was first introduced in 1974 and is an automatic chronograph with hour recorder and date. Being relatively cheap to produce and extremely reliable, this movement has become widely adopted in various guises by many of the major watch manufacturers.
 

Rolex was not among the chronograph pioneers, choosing to focus their energies on the Oyster and the Perpetual. However the success of these watches propelled Rolex to be in the position of being the "sportsman's" watch and sportsmen demand a chronograph.
Instead of developing their own movement Rolex chose to use the Valjoux movement. It was available in three sizes and they were all simple one button chronographs. These allowed the user to time one continuous event.

This one button chronograph was popular but the more it was used the more obvious its limitations were. Customers demanded the ability to stop the watch intermittently which was of course impossible without resetting the time. It was not until the late 1930's that anything changed with the arrival of the two button chronograph. This was a major breakthrough and now allowed people to stop the watch to take necessary breaks and than restart it on the same time as when they left off. A football referee could stop the watch each time a ball went out an then get an accurate 45 minutes play.

At the end of the 1930's the "Zerograph" was produced in very limited quantities. The watch model 3462 marked an important turning point for Rolex as it was the first watch to feature the Oyster crown and is now extremely sort after.

The first true Oyster chronograph was the model 4500, which never sold in huge quantities as it was released during World War II. The 6232 and the 3668 models followed but proved just as unpopular. Both new models used the 13" Valjoux movement and had just a thirty minute register. While Rolex in 1942 had introduced an hour recorder it was a snap on back it would be another seven years before the Oyster case and the three button chronograph would be brought together in the form of the 5034. During the next fifteen years the 5034 changed into the 6034, which then became the 6234. This in turn became the 6238 and then finally evolved into the 6239.

These changes although little by little had inspired Rolex to revive the previously shelved name the "Cosmograph". The only difference between the 6239 and the 6238 was that on the 6239 the bezel was engraved with tachymeter graduations rather than having them on the dial.

The last major changes to the manual wind chronograph came in the late 1970's when Rolex introduced the 6263 model. This was the first model to have truly waterproof pushers. The earlier Oyster Chronographs had simple round pushers with internal gaskets as the only sealing mechanism.

The screw down pushers were added to stop people pressing the buttons, whilst submerged in water. The locking function also prevented the chronograph being activated inadvertently. The new 6263 started life as being waterproof to 165 feet, ten years later it was capable of twice that depth (100 meters) The 6263 is unusual in the fact that the quality of the movement depended on which case you had. The steel chronograph movements were not timed to a chronometer standard.

Despite the innovative design it was not until 1986 when the popularity of the Daytona started to increase, reaching its zenith with a particular Daytona model, the "Paul Newman". This model featured square markers on the subsidiary dials, and an outer track the same colour as the subsidiary dials. Although the origins of this nickname for the dial are obscure this is the easiest term to refer to this watch. This unusual dial colourful and deco in appearance was only in production for a short period of time form its introduction in 1970.

Rolex finally released the new version of the Daytona in 1991. They had abandoned the workhorse Valjoux movement in favour of the Zenith movement. The new dials featured large subsidiary dials and had an inner track in a contrasting colour. Dial colours included black, white, champagne and each watch had "Daytona" in red on the dial and they all had screw-down pushers.

The stainless steel Daytona has become one of the most sought after watches of all time. Because there were higher profit margins in the gold and mixed metal watches there was a shortage of the steel one as there just were not enough being produced.

Rolex's latest addition to the Daytona hysteria was launched at the end of 2000. The 116520 which like the rest of Rolex's models has an extra 1 prefix to differentiate it from the others. There have been a few dial refinements but the main difference is the fact that Rolex are now using an in house movement instead of the old Zenith one.

The Daytona's popularity can only be said to be growing.
 

A Comparison of ETA Movements
Some Other Differences

www.uhrenwerkzeug.com


Forum: TimeZone - Advanced Forum
Re: Compare/contrast ETA 2824 and 2892-A2 movement (James Donabed)
Date: Fri, 12 Dec 1997 07:46:19 GMT
From: Walt Odets <odets@csi.com>

In addition to SJX's comment on the thickness differences, other differences include the 2892 with 21 jewels, 42 hour power reserve, enlarged ball bearing rotor mount, Glucydur balance; the 2824 with 25 jewels, 38 hour PR, often used with a less expensive balance.

Beyond this, the 2824 is very similar in construction to most of the other ETA's, including the 2688, 2671, 2688, 2685, etc., all of which are basically ETA ("in house") developments beginning in 1949. The 2892 is the most recent ETA (basic automatic) caliber and, unlike most of the other ETA's currently in production, the 2892 was derived from an outside design, the Eterna-matic 3000, Cal. 1466-U, first released in 1963 (by Eterna). When finally made available as an ETA movement in 1976, it was very flat for an automatic with center sweep and date, had a distinct developmental history outside ETA and had accumulated a very good record of reliability in the Eterna watches. It is quite different in construction from the other ETA's and appears much more robust to the eye than most of the "in house" ETA movements.

An historical note: ETA was the movement manufacturing division of Eterna until 1932 when it split off and joined Ebauches S.A. (which included other big manufacturers like A. Schild). Eterna continued independent development of movements (which is how it came up with the 1466U/2892), although Eterna and ETA also worked jointly on some designs. Almost all (all?) ETA and Eterna automatics share the Eterna-designed automatic winding system: a ball bearing mounted rotor winding in two directions via springless twin click wheels and two reduction wheels on the locking wheel

A side note on the 2824: Introduced by ETA in 1972, the 2824 was used in a 36,000 beat chronometer form by Ulysse Nardin (though it was available as a 28,800). UN has apparently reintroduced this movement in some of the San Marcos "fast beat" chronometers.

A final word on the 2892: If you see an automatic advertised with 21 jewels it is almost surely this movement.

And a closing remark: I haven't uttered a single peep about a watchmaker who shall be nameless, but whose initials are Franck Muller
 

The Russian watch-and-clock-making industry uses western technology and know-how since over 70 years. Russian watches are high-quality, cost however only a fraction of their western "colleagues". Divide with us the joy in these marvelous collectors watches...

Первый московский часовой завод " ...ИНФОРМАЦИЯ: INFO@POLJOT.RU. ТОРГОВЛЯ И СБЫТ: TRADE@POLJOT. RU. ENGLISH VERSION. О заводе | Новости ...
 
www.uhrenbeweger24.de

01. Amphibian 2416B/420335
02. Poljot Aviator 26669/1225817
03. Poljot Aviator Mechanical 3105/6973643
04. Poljot Buran Alarm 2612/6503714
05. Vostok Ministry Amphibian
06. Amphibian KGB 2416B/921457
07. SALE Buran 2824-2/6503711
08. Amphibia Blue 2416B/420007
09. Poljot Aviator Chronograph 31681/6973607
10. Poljot Aviator Mechanical 3105/6973645
 

Russian Watches Poljot and Vostok Store

 
Welcome to our online store. There can find watches of the best Russian trade-marks - Poljot, Vostok. These watches are very popular both in Russia and abroad for a combination of high precision, reliability and modern design. The super watch movements and design can be compared well with the most famous world watch brand names, but their cost is rather low.
In our store you can find such famous watches as

Poljot: Aviator, Chronograph, Buran, President, Alarms, Shturmanskie
Vostok: Amphibian, Komandirskie, Neptun
If there are no Poljot and Vostok watches which you want to buy or there are no watches in desired quantity, you may email us and we will be very glad to help you.