Screw-down crown - Screw-down & see-through case back with sapphire glass
The movement has a rhodium coated oscillating weight on ball bearing decorated with "Côtes de Genève" pattern, engraved with an airplane and embellished with GLYCINE crowns. The bridges are rhodium coated and decorated "perlé", with visible screws in blue finish.
GMT Version (4 hands, three timezones) . Topring with red 5N gold-plated mark
The third time zone is set on the rotating bezel, positioned by a spacer system at 4h with a hatched crown (design early 50is).