Production of Vacheron Constantin minute-repeating wristwatches:38 examples in total, in pink, yellow, and white gold, and platinum: - 17 examples in 1942 - 9 examples in 1944 - 12 examples in 1951.Collectors and professionals worldwide consider this to be the most beautiful minute-repeating wristwatch made in the last 60 years.What is a Minute-Repeater?A minute-repeating watch tells the time both visually and audibly. A slide on the side of the case, usually near the 9, will activate two hammers in the movement. These hammers strike two gongs curled within the case. First one hammer strikes a gong of a lower tonality, which sounds the hours. Then both hammers strike both gongs alternately to count out the quarter hours after that hour, and finally the second hammer alone striking on a higher gong sounds the minutes after that quarter hour. Therepeating mechanism was developed by English watchmaker Daniel Quare, who, in 1687, patented a mechanism that sounded the hours and the quarter hours. The early repeaters used bells. At the end of the 18th century, two bent-wire gongs became more commonly used. In 1892, the first minute-repeating wristwatch, a model with a round case, was produced by Omega.