Numerous manufacturers produce moon phase watches, covering a wide price range. The most affordable models start at less than 1,100 USD, while more exclusive timepieces can cost upwards of 110,000 USD. Watches on the upper end of the price range often feature a unique moon phase mechanism and perpetual calendar. One prominent example is the Richard Lange Perpetual Calendar Terraluna from A. Lange & Söhne. This model has an orbital moon phase display on the reverse side of its case. Thanks to its intricate mechanics, this display only requires manual correction every 1,058 years. More conventional moon phase displays tend to deviate by about eight hours per year, meaning they will be off by one full day after three years. Of course, all this technical mastery has its price: the Richard Lange Perpetual Calendar Terraluna costs around 178,000 USD in red or white gold.