Number of authentic autographs that exist
I have always been curious, how many autographs exist of say Barack Obama? How about Steven Spielberg? I know some people due to their jobs sign many more autographs than others. There are also those people who refuse to sign so less autographs exists, such as Steve Jobs. But someone like Neil Armstrong signed a bunch then slowed down significantly. I wonder how many existing authentic autographs probably exists in the world of the typical U.S. President and how many for actors, or writers, athletes, astronauts etc.
I tried Google but couldn’t really find what I wanted. I am looking for an estimated number of autographs signed (on any format) in authentic form that still exist in the world. I also understand over time, especially if the signer died, fewer and fewer examples will exist overtime as existing autographs get lost, destroyed, faded, or ruined in some manner.
I do know, however, that existing William Shakespeare autographs is six. I read about them a while back and how they are all very different from each other and he is considered the single most valuable autograph in the world, worth over $1 million. I know willing signers that are old and still signing probably have a greater number of existing autographs than others, such as say Betty White. Has she signed over a million autographs that are now currently existing in the world?