In the series, the movements marked вЂEвЂ™ or вЂHвЂ™ were of the highest quality, while вЂCвЂ™ represented the lowest quality level. However, Jones used it as a kind of construction and quality mark. Howard applied a letter to indicate the diameter of a pocket watch movement. It is assumed that Jones has been inspired using a letter by his previous employer E. However, there are calibre Jones movements on which the letter is lacking. after the letter engraved on the movement. Calibre Jones movements are usually called pattern B, C etc. The three quarter movements of calibre Jones watches usually carry several engravements, among them a gracefully applied letter: B, C, D, E, H, R or S. The majority of these original cases have been removed over time to recuperate the precious metal. About 50 % of all Jones movements were originally exported to the USA, where they were cased in gold or coin silver, engine turned cases, made by different American case makers. Most of them are defect or incomplete movements without a case. A minority of these is key wind, key set: about 80 watches.

It is estimated that no more than 2 % of the watches still exist, that is around 500 watches (ref. Jones, working in the middle of this transition period, produced all three types simultaneously: key wind, key set as well as stem wind, lever set and stem wind, stem set.ДЄ total of approximately 25.500 Jones watches have been made. It was more convenient to wind the movement over a crown and to set the hands by using a lever or as well by the crown, making a key redundant. Then a gradual shift took place in winding and setting a watch. Until 1870 most pocket watches were wound and set by a key. During the last quarter of the 19th century, a major change had taken place in the construction of pocket watches in the USA and Europe. Jones and his successor Frederick Ferdinand Seeland had already left Switzerland and the production of Jones watches had stopped. Although IWC keeps one of the best watch archives known, the early production has not been documented perfectly and IWC states that the reliability of the archives is only acceptable after 1885.ДЄt that time F.A. They are known as calibre вЂJonesвЂ™ pocket watches. When Florentine Ariosto Jones started up his watch manufacture at Schaffhausen in 1868, it lasted four years before the first watches could leave the factory.

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