nailed it!

"For want of a nail the shoe was lost,
for want of a shoe the horse was lost;
and for want of a horse the rider was lost;
being overtaken and slain by the enemy,
all for want of care about a horse-shoe nail.
"
-Benjamin Franklin
The Way to Wealth (1758)

a personal reminder that something of great importance may depend on an apparently trivial detail.

Art Deco era sterling silver horseshoe nail jabot pin, my most recent prized find =]