According to Cartier customer service when I asked about the variations, each Cartier workshop around the globe will have their own hallmark. This is in addition to whatever the country of sale insists upon (e.g. the eagle in France).
The eagle's head hallmark is commonly seen on French made items of gold since 1838. It represents an item that has tested to be constructed of a minimum 18k or 750/1000 parts gold. The letters “db” appear to be the maker’s mark which is different. It may be present on jewelry regardless of the gold content.According to Cartier customer service when I asked about the variations, each Cartier workshop around the globe will have their own hallmark. This is in addition to whatever the country of sale insists upon (e.g. the eagle in France).