The dials on the Tresor watches are also noteworthy, as they have a choice between embossed or transferred Roman numerals that elegantly surround the dial. Each Tresor model also features a special mirror caseback, which is created by applying a metallization treatment on the sapphire glass. It is designed to be used for quick touch-ups of makeup.

A Duet Limited Editions

IWC Ingenieur Replica unveiled its Tresor collection at Baselworld, and the timepieces are now available in boutiques. But they didn't disappoint by revealing two limited editions which show some of the possibilities for the collection.

The first is a new metiers-d'art dial that has aventurine at its base. The majority of aventurine dials use a block made from aventurine glass, which is then decorated with numbers. However, IWC Ingenieur Replica's creative team decided to experiment by grinding the aventurine into a fine powder, and using it as enamel. The patented process begins with a gold dial (IWC Ingenieur Replica) onto which four to five layers of enamel aventurine is applied. After each layer of enamel, the dial is fired at temperatures between 1000oC and 1500oC in a kiln. It is then polished. This technique allows for the dial to be flush to the numerals, which is impossible otherwise as aventurine is fragile and cannot be cut.

The case for the Tresor aventurine is made of IWC Ingenieur Replica's Canopus White Gold, another proprietary alloy that has been designed to increase brightness, whiteness, and durability through its combination of gold, platinum, and rhodium.

The second limited edition Tresor features a mother of pearl dial, which was taken directly from the centre of the shell. It is almost unheard-of to cut the numerals out of mother-of pearl,Panerai Luminor Replica Watches due to its fragility. This disc is then placed over the dial's raised Roman numerals. This allows the Roman numerals on the dial to be set in diamonds.

Tresor also released a new dial animation featuring a deep burgundy strap and dial, as well as a range of other strap colours so that owners could customize the appearance of their watches. Straps are available in alligator leather with a satin finish or lamb skin plated, giving the watch a completely different look.