11th President: James K Polk, 1845
Dot = 11 (Polk was the eleventh president)
Polka(dot) = Polk
Overall = 845 = 1845 became president
James Bond = James
They saw a dot (11) coming round the corner . . .
. . . It turned out to be the President wearing his polka (Polk) dot overall (845 = 1845).
Connect Polk to James:
And the President occasionally lent his overall to James Bond (James). Imagine polka (Polk) dots all over James Bond.
NOTE: The way Mammoth Memory remembers James is to think of James Bond.