The Perpetual Moon watch has been announced ahead of the Baselworld exhibition as part of Arnold & Son's Royal Collection. Current reports on pricing puts it at around $16,000, and the watch comes in steel or 18k rose gold and features a three dimensional moon that will represent lunar phases for 122 years without correction.

Which means, a watch for your future generations! It's got an 80 hour power reserve and the mechanism includes 27 precious stones. [BornRich, A Timely Perspective]