Released in 2014, the Lange 1 Tourbillon Perpetual Calendar is a stunning timepiece. It shares a mirrored dial design and self-winding feature with the Daymatic model. However, it goes above and beyond with its additional functions including a perpetual calendar, moonphase, and tourbillon escapement, which can be admired through the transparent caseback. The Ref. 720.025 version boasts a sleek platinum case and is a limited edition of only 100 pieces.