

The present lot is further distinguishable by the Sigma sign on the dial that signifies the use of gold, in this case that the hands and indexes were originally made from white gold. The sigma symbol was being used during the 1970's in collaboration with l'Association pour la Promotion Industrielle de l'Or (APRIOR). With the ever rising competition from overseas, the Swiss industry tried to promote the value of watches that used gold as material and differentiate those pieces.