From dual Bvlgari watches touched by Gérald Genta to 1970s gold Piaget with Cartier signature.
Bvlgari Ref. 55 – 7471

This watch features dual time zone indication with an intriguing design of two cases and two movements. The construction itself is made of steel, while each case is yellow gold. Models like this are known as Gemini. These watches, released in the 1980s, were crafted by Ebel in collaboration with the famous Gérald Genta. This is confirmed by opening the case and examining both manual winding movements that power the model.
Estimate: CHF 2,000 – 4,000
Sold for CHF 21,590
Patek Philippe Ref. 550

This watch is one of the rarest Patek Philippe models. Produced in the 1920s – 1930s, it has almost never appeared at auctions. To be precise, this is the third Ref. 550 that has ever surfaced at auctions. It dates back to 1929. The model is distinguished by a rectangular pink gold case, pyramid-shaped hour markers, and rectangular glass.
Estimate: CHF 4,000 – 8,000
Sold for CHF 33,020
Chaumet Ref. 10A Pléiade

The 1992 watch features a UFO-shaped case made of yellow gold. Inside is a jump hour function mechanism developed by François-Paul Journe, based on the ETA 2892-2 caliber.
Estimate: CHF 5,000 – 10,000
Sold for CHF 72,390
Rolex Ref. 126660 Sea-Dweller Deepsea “James Cameron”

This watch is an evolution of the experimental Deepsea model that accompanied James Cameron on his 2012 expedition to the Mariana Trench. The 44 mm steel case has a water resistance of 3900 meters. Features include a gradient dial that mimics the ocean's color changes at great depths and a helium escape valve. Released in 2021.
Estimate: CHF 5,000 – 10,000
Sold for CHF 19,050
Andersen Geneve World Time “Columbus”

This limited edition world timer was released to mark the 500th anniversary of Christopher Columbus's famous expedition. This piece (number 336 in a series of 500) is dated 1998. The 35 mm case is made of white gold. The dial features a map of the Atlantic Ocean and Columbus's first voyage route, done in Chinese lacquer technique.
Estimate: CHF 5,000 – 10,000
Sold for CHF 24,130
Omega Ref. 311.32.42.30.04.001 Speedmaster Alaska Project

This 2008 watch pays tribute to the Alaska Project, which focused on developing watches suitable for space flights and NASA manned missions. Released in a limited series of 1970 pieces, it features a 42 mm steel case with a removable anodized aluminum protective cover. Cosmic references are seen in the shape of the hands on the chronograph counters.
Estimate: CHF 5,000 – 10,000
Sold for CHF 27,940
Grand Seiko Ref. 6145-8030 61GS

The highlight of this model is the textured yellow gold case, crafted using the hand-hammering technique. It is complemented by a champagne-colored dial with a pattern reminiscent of linen and tree bark.
The watch was produced from 1968 to 1975 and was the flagship model of Grand Seiko during that period. It houses a high-frequency automatic movement.
Estimate: CHF 5,000 – 10,000
Sold for CHF 38,100
Piaget Ref. 91104

This watch is distinguished by its intricate inlay. Released around 2000, it features a white gold case, likely a private order. The bezel is set with emeralds, and due to their fragility, emeralds are used only in exceptional cases. The model's elegance is enhanced by diamonds on the dial center and baguette sapphires as hour markers.
Estimate: CHF 8,000 – 16,000
Sold for CHF 48,250
Patek Philippe Ref. 3541 Calatrava

This watch, along with several other mid-century Patek Philippe models, marked the brand's foray into sports watches aimed at a younger audience. This particular piece is dated 1968, featuring a 36 mm yellow gold case and a black dial with rare Roman numerals for Patek Philippe. Judging by the case's condition, it has never been polished. Fewer than 40 pieces from this series are known today.
Estimate: CHF 10,000 – 20,000
Sold for CHF 48,260
Piaget Ref. 612406

Another watch with dual time zone indication via separate movements. The presence of two movements is indicated by two crowns. The case is made of yellow gold, and the dial features the