Thunderchief pilot during Nam wore a breitling "pizza" model ref 819 as his everyday watch and it is still today his everyday watch after 38 years. The breitling collectors, pilots and users know very well why Breitling made cases this large. It is kinda like the B Uhr watches made during word war II by Laco , Lange&Söhne and IWC and which were almost 50mm!!!