The Panerai Luminor Chrono Tantalum PAM 192 was released in 2004 as a limited edition of 300 pieces. Encased in tantalum the rare material has a natural bluish gray appearance with a lustrous sheen that is also highly corrosion-resistant which is perhaps why it might be the perfect case material to incorporate in a sports wristwatch. Powered by the Lemania-based cal. OPXVI manually-wound chronograph movement the movement beats at a frequency of 21600 bph.