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Yes the first number in the case serial # indicates the year in the decade.  However the decade isn’t indicated.  We determine the decade by the model and advertisements.  There is a 1940 and 1943 Stamford in the DB so without doing some research it might be a 1936 or 1946.  The date stamp on the movement might give us some insight.  The years this model was advertised might help as well.