- Early examples of this model with the double case backs are rare and highly sought after, often fetching more than double the price of a later model.
- In 1961, Edox launched the " Delfin " line of watches, with industry-first double case backs for water resistance to 200 meters.
- The two fathers are shocked to find their sons and daughters; the quartet claim that they too have married, in what appears to be a double case of incest.
- The " Delfin " line of watches launched in 1961, with industry-first double case backs for high standards of shock protection, water resistance, and ruggedness.
- The double platoon is easily identifiable from the real one due to their differently shaped eyes, and their somewhat curled feet ( and, in Kururu's double case, a conic head ), but Fuyuki and Natsumi were unable to notice the difference.