CHALLENGE case 53.70mm X 41mm
Materials: Titanium grade 2
Caseback: Open with sapphire crystal, none-reflecting coating
Calibre: CVSTOS 76510 hand wound openwork Minute Repeater and Tourbillon movement
Power-reserve: 60 hours
Functions: Hour, minute and “3 X 20 Seconds” indicator. Minute Repeater mechanism chimes hours, quarters and minutes on demand. Chime mechanism function indicator.