It must be remembered that a movement might not go straight into a case which itself may have been on the shelf for a while so there will be some overlap, also the hallmarking years of the various assay houses are not in line with each other or the with calendar but the difference is small and the date is likely to be accurate to plus or minus a year. Perhaps someone can provide some information about this ladies Tavannes wrist watch. There is no production database for Tavannes linking serial numbers to production date. Benson appear to have switched from Revue to Tavannes in about 1932 the database is only good for the 1930s. 15 jewel Tavannes pocket watch serial 4520704. Benson, largely because other retailers frequently used Swiss hallmarked silver cases which do not carry a date mark. ![]() Although this particular movement has the legend 'Tavannes Watch Co' engraved on the ratchet wheel, these movements are often seen without any reference to the manufacturer. The sample is heavily biased to watches retailed by J.W. The photograph shows a 13 (thirteen ligne) Tavannes Calibre 330 series 13 (13 ligne) movement from a Borgel wristwatch. My dating is based on a reasonable number of watches, listed below, in hallmarked silver or gold movements. ![]() FOR SALE This is a very nice looking very nice running Cyma. The serial number on these movements are under the dial as show to the right. 12s POCKET WATCH 15j ADJ GOLD CASE EARLY 1900s RUNS - 40.00.
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