Young man with sweater and slacks (unidentified) and William Parker Lyon standing by sedan automobile piled high with what appears to be museum artifacts. On hood of car is a sign reading: We are moving. Auto license seems to bear date in 1930's, Apparently this was at time Pony Express Museum was moved to Arcadia in 1935.

https://arcadiahistory.andornot.com/en/permalink/photographs473