WELLS FARGO INGOT FIVE DOLLARS R.R. EXPRESS 1860

I HAVE NO IDEA WHAT THIS IS, IT WAS IN WITH A COLLECTION OF OLD RAILROAD STUFF FROM AN AUCTION. MEASURES 3 3/4" X 1 1/4"...WEIGHS 4 OUNCES........ON THE FRONT IT SAYS WELLS FARGO CO. FIVE DOLLARS R.R. EXPRESS 1860.....THE BACK HAS A DEPRESSION OF AN EAGLE WITH THE LETTER F OE E STAMPED NEARBY AND T'S ALSO A CIRCLE WITH THE LETTERS CD.......FEELS LIKE IRON........I REALLY DON'T KNOW.........SHIPPING IS $5