On a technical note for everyone, this 5088/100P version does appear in the regular catalog and is officially not limited, unlike the earlier release of this series, ref. 5088P. However, like all rare handcrafts, a 5088/100P remains *extremely* rare to source and is only reserved to the top clients. I believe I have seen only one or two in person so far, and it's not even displayed at the regular Patek events.
