The Mysterium is a remarkable watch by any measure. Both a scientific an aesthetic breakthrough. It's so remarkable, in fact, that it's attracted the attention of the nations leading scientific laboratory. One of its top engineers contacted us to ask how we do it. Make aluminum absolutely transparent. Regrettably, we couldn't share the information with him. For it's a remarkable feat that took us more than 4 years to accomplish. And the very time consuming process allows us to manufacture only a handful of Mysteriums a week. The Mysterium is impressively oversized too at 51 mm. Mechanical, manually wound, with exhibition back. Anti-reflective sapphire crystal. Made in Switzerland as a limited edition of 1,000. For more information, call toll free 1-800-441-8433 or visit online at Kriegerwatch.com