At the heart of this timepiece resides a miniature moon made of wootz steel, whose complex, ornate structure recalls the moon's surface dotted with craters. The spherical moon-phase indicator is made of silver and covered with black rhodium. The Wootz steel used to craft the case and miniature moon was smelted by wootz-steel expert Sergei Luniov, one of Russia's best smiths and gunmakers.
Wootz steel is a particularly strong material that has been used to make swords, daggers and other weapons for centuries.
The movement is equipped with 25 jewels and a power reserve of 48 hours. The arch around the moon-phase indicator displays the hours: from midnight to midday, the moon is the indicator while from midday to midnight, it is the sun. Meanwhile, the sub-dial in the lower part of the dial shows the minutes.
via Konstantin-Chaykin.com