Cook hard eggs to hard-boiled.
Slice olives and set aside.
Dice hard-boiled eggs.
Add eggs, mayonnaise, celery salt, salt, and pepper to a large bowl and carefully stir until mixed.
Gently fold in olive slices.
Cover with plastic wrap and chill in the refrigerator for 1-2 hours.
Serve alone on a slice of lettuce or between two slices of bread.
Garnish with extra olives.