Produced between 1982 and 1984 reference 3710 was made in a very limited run of 150 pieces. This piece happens to be the last ever produced with the number 150. The reference 3710 developed amid the Swiss quartz crisis was the first complicated wristwatch made by the firm featuring a moon phase. Unknown to the general public as these were never advertised in catalogues these traditional yet complicated wristwatches were quickly all sold and represent a milestone in the development of IWC right before the launch of the perpetual Da Vinci.