It's simple things that keep watch collectors happy. In recent years a lot more emphasis has been placed on a watch's "power reserve", i.e how long it will keep accurate time without needing a wind. This is often only a day or so, which is no problem if you wear a watch all the time, but for those with a watch collection, with watches often left in a case, it can be an issue. A Lange & Söhne has addressed this dilemma, solving what it says is "one of the few as yet unmastered horological feats".
It has invented a mechanism with a power reserve of 31 days, which means the Lange 31 only needs winding once a month. Best of all, it is able to deliver that power evenly through the whole month. Thanks to some very clever engineering and something called a "constant force escapement", it keeps perfect time all month. With a 46mm platinum case and a face that is clean and elegant, Lange & Söhne has surpassed itself in being able to deliver all this complexity in a watch that is as understated and beautifully designed as it is clever.