This is a limited series from the Trilogy line. Siding Spring Limited Edition – 50 Pieces The Siding Spring symbolizes the orbital characteristics of the comet Siding Spring through its retrograde display. The retrograde seconds are shown in two overlapping phases: once the first phase concludes after 30 seconds, a second hand automatically takes over, moving from the thirtieth to the sixtieth second. When the sixtieth second is reached, the sequence begins again. In addition, the watch features a true 12-hour GMT display. This can be set to a second time zone by turning the hands counterclockwise. Specifications • Case: brushed / Bezel polished stainless steel • Sapphire crystal • Case diameter: 42 mm • Movement: hand-wound SW-07 with fine Schaumburger 3/4 Bridge • Finish: engraved with Gothic window • ***The limited number is engraved on the ratchet wheel after sale. The numbers shown may vary.*** • Functions: second time zone, hours, minutes, retrograde second • Strap: leather • Leather box color may vary.