The Swiss watch brand IWC has launched two of its most complicated Ingenieur watches in 18 karat gold red, the Ingenieur Constant-Force Tourbillon and the Ingenieur Perpetual Calendar Digital Date-Month.

The new Ingenieur Constant-Force Tourbillon, limited to only 50 pieces, has a constant mechanism, a black dial, black crocodile leather strap and buckle 18K red gold.

While the Ingenieur Perpetual Calendar Digital Date-Month, limited to 100 pieces, inlcuding alack line whith inlaid sapphire glass, black rubber strap with crocodile leather inlaid and titanium buckle.