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  The numbers and signs that determine the period
   
Type of watch : wrist, pocket, etc. Winding : key, crown, automatic
Case : hunter, Lépine, etc. Calibre : L18.68, for example
Shape : (i.e, round) and size (diameter) Consecutive number : 2.426.236, for ex.
Material : gold, silver, steel, etc.
Reference number : 4232, for example
   
 
 
     
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