Audemars Piguet

hello all i came across this piece of art the caliber 2870 y/g and was wondering how many pieces were made?any ideas. thank you

Extract from: indepth.watchprosite.com But Maurice Grimm did more than that - he developed 3 tourbillon watches (almost) single-handedly: - The ultra-thin automatic tourbillion for Audemars Piguet (caliber 2870) in 1986 - The Audemars automatic to...