One of the bottom photos is loose and on the back is written:
Grandmother this is your
boy with the Ambulance
his Grandfather G. gave him
I am guessing that "Grandmother" is his paternal grandmother, Sarah (Lowell) Copeland (1833-1916) who lived in Maine in 1902. "Your boy" is of course, my grandfather, Lowell Townsend Copeland. I am guessing that "his Grandfather G" is Samuel Sewall Greeley. His family lived in Winnetka, Illinois.
Look closely - the ambulance is horse-drawn.