To celebrate 130 years of Alpina, the Alpina 130 Aviator series was created. Measuring 41.5 mm wide, the line uses the caliber AL- 860 that provides a chronograph function. It comes in many different materials and is water-resistant to 50 meters. The back of the case is transparent.
The photos above were taken from the net.
My personal favorite is the all stainless steel version.