The Aquatimer has a modern sleek appeal with a ‘super compressor’ case that has less bulk compared with other dive watches of the era. A timing ring placed underneath the crystal replaces the outer rotating bezel. This works as a safety mechanism keeping the bezel from being bumped and accidentally changing the time as well as giving the watch a flatter profile. Furthermore the in-house caliber 8541B movement features the innovative “Pellaton” winding system patented by IWC in 1950. This horological innovation uses a bi-directional rotor improved efficiency giving greater winding power. Reference 1816 features a cushion-shaped case with luminous hands and hour markers rendering the dial easy-to-read and extremely recognisable from vintage divers watch collector. Offered overall in great condition the presented lot is an interesting and early divers watch from IWC and definitely a must-have for collectors new and experienced alike.