3 superimposed dials:
• Map of the northern hemisphere with sunburst satin-finished continents & velvet-finished seas. Translucent blue-lacquered disc with transferred city names
• Sapphire disc with transferred day/night and 24-hour indications (period between 6.30pm and 6.30am highlighted with a black background)
• Translucent blue-lacquered ring, opaline-finished, transferred minute-track 18K gold hours and minutes hands highlighted with white luminescent material"