Panerai Radiomir Ceramica PAM00643. R series of 1000. Case diameter 45mm water resistant to 100 meters. Hand-wound mechanical, Panerai OP X calibre with swan’s neck regulator, 17 jewels, Power reserve 56 hours. Black sandwich dial with luminous hour markers and numerals. Black leather strap with ceramic buckle. Box and papers dated March 2016. PAM 643. Our reference S21236.