11/20/2022 0 Comments Tavannes watch co serial numbers![]() ![]() Submarine Watch: Made by Tavannes, Sold by Brook & Son Click image to enlarge One of these Submarine wristwatches is in the possession of a good friend of mine, Richard Edwards, and the pictures of the watch further down the page are reproduced with Richard's kind permission. ![]() A watch fulfilling every one of these conditions, and fitted in addition with a small luminous seconds-hand, has now been on the market for some months, and appears to have before it a distinctive sphere of usefulness. ![]() (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. 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. (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. ![]()
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