Abraham Lincoln’s pocket watch had an inscription inside of it, that he didn’t even know about. A watchmaker was fixing Abe’s pocket watch when the news of the attack on Fort Sumter reached Washington, D.C.
The watchmaker unscrewed the pocket watch and used a sharp instrument to write inside of it. He wrote
April 13-1861 Fort Sumpter [sic] was attacked by the rebels on the above date J Dillon April 13-1861 Washington Thank God we have a government Jonth Dillon”
Abe Lincoln never knew of this, in fact no one but the watchmaker knew exactly what was written in that watch until 150 years later.