Calibre 79091 75 jewels in-line escapement repeating on gongs via hammers the white dial with applied gold faceted hour markers four engine-turned subdials for small seconds combined with days date minute counter with moon-phases and hour counter with months aperture for four-digit year in three-part case back inscribed 1991 No. 18/50 Platinum and secured by six screws screw-down crown repeating slide and two chronograph buttons in the band 950 platinum IWC bracelet case dial and movement signed