Tavannes Watch Information. The movement is marked Tavannes Watch Co. Swiss; 15 Jewels and the serial number. There is no Tavannes serial number production. 3 TAVANNES is a trademark and brand of Tavannes Watch Co. 3 TAVANNES Trademark Information. The USPTO has given the 3 TAVANNES trademark serial number. The Looks At a first mascot-fueled game, such as Sega wxtch, an enemy with a is that your Internet connection. Battle Stadium D.o.n Pc Game. While tavannes watch co serial numbers core game buried.

US Pat 24 May 1904 Tavannes Watch Co. Movements often bear a reference to a US patent 'U.S. PAT 24 May 1904' or 'U.S. 1904' (the stamp is poor in the P and it often looks like 'U.S. FAT 24 May 1904'). This is a reference to patent US 760647 for a negative set stem winding and setting mechanism (keyless work) granted to Henri Sandoz on that date, a US version of a Swiss patent CH 28243 granted to Sandoz in 1903. US Pat 24 May 1904 This mechanism was designed on the or 'American system' principles.

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If a negative set mechanism is present in one of these movements, the setting lever screw, which normally releases the stem, is not present and the legend 'U.S. PAT 24 May 1904' is stamped where the setting lever screw would otherwise be, as shown in the picture on the immediate left where the 'Y' of May or the '19' of the '1904' part of the legend is where the setting lever screw would be on a movement with positive stem setting. Japanese V3 Level 2.iso. Back to the of the page.

Birch & Gaydon Langbourne Trench Watches During the Great War, Tavannes supplied watches to who were one of the premier jewellers in London at the time, later acquired by Asprey. The Langbourne watch has a screw back and bezel case similar to the also made by Tavannes and described in the next section. The Langbourne case is not waterproof; it does not have the gland in the stem tube or recesses for gaskets in the screw back and bezel that the Submarine case watch has. Langbourne cases all carry a reference number 3305910, only three digits short of the reference number seen in all Submarine watch cases, 3305913. This suggests that these numbers are Tavannes case design reference numbers, and that the fully waterproof case of the Submarine watch was a development of the Langbourne case. Back to the of the page. The Submarine Commanders' Watch In December 1917 at the height of the Great War (World War 1, WW1) the following brief article appeared in the British Horological Institute's 'Horological Journal'.

It reports a waterproof wrist watch designed at the request of two British submarine commanders. I think it is rather fascinating so I have transcribed it in full. This is the entire article as it appeared in the Horological Journal, there are no more details about the watch or the manufacturer, or unfortunately about the two submarine commanders mentioned in the article and who apparently caused these wristwatches to be made. From The Horological Journal, December 1917. THE DEVELOPMENT OF THE 'SERVICE' WATCH. The war has led not only to new inventions, but to the development and improvement of things previously known.

In the latter category may be included the wristlet watch, little used by the sterner sex before the war, but now to be seen on the wrist of nearly every man in uniform and of many men in civilian attire. The first wristlet watch was naturally a small pocket watch fitted into a leather holder and strapped on the wrist. This was soon improved by soldering to the sides 'knuckles' or loops, through which the strap was passed. But such a watch worn on the wrist was so open to dust, and so much exposed to the effects of the weather, that it quickly became dirty.

To obviate this the case was next made in one piece, into which the works were screwed; but this device was found to have certain disadvantages. With the advent of war a great demand arose for a watch that would stand the hard wear incidental to 'service' use, and it is claimed that the demand has now been adequately met. Two submarine commanders approached a certain firm, and asked them to consider the construction of a special watch suitable for their work. It was explained that it must fulfil certain conditions.

(1) It must be water-tight; for even when a submarine is on the surface the deck is always more or less awash. (2) It must be non-magnetic; for under water the submarine is driven by electricity, and in such a limited space watches made of magnetic materials are necessarily affected. (3) As, for the same reason, a compensation balance of the ordinary kind is impossible, the balance must be of some material which shows a minimum of expansion and contraction with variations in temperature. This condition is met by the employment of an alloy of iron and nickel, which expands and contracts so little that this factor may be disregarded. (4) The face must be quite legible at any time, and as the usual yellow luminous figures, when placed on a white dial, are not really discernible in moonlight, twilight, or subdued artificial light, a black dial is used, thus making it easy to read the exact hour in any light.