what is the william h gross stamp gallery 
established in 2013 as part of the smithsonian national postal museum in washington d c and named after its primary benefactor the william h gross stamp gallery is the world s largest gallery dedicated to philately distributed throughout the thematic areas are hundreds of pullout frames containing more than 20 000 objects providing opportunities to view noteworthy stamps that have never been on public display 11the bottom linebill gross is a renowned bond investor who led his pacific investment management company pimco to become the largest active fixed income fund management firm in the world he is a successful author and stamp collector 