FabR[Senior Patek Moderator]
26166
Sincere congrats on seizing this beauty my friend, really happy for a well-deserving collector such as yourself --- this is a lovely "new generation" Calatrava, and one of the most youthful and original entries to Patek's entire catalog!
Each AD is unlikely to receive from Patek more than one or two per year, so this VERY sought-after allocation really speaks volumes of your quality and passion as a Patek collector! 
Enjoy thoroughly!