antique walnut wardrobe armoire and nightstand

I have an antique armoire. It has five drawers in the bottom half on the inside and shelves for the top half. On the very top there is a hidden compartment. I can tell by the screws that they're not made from a machine from today. 

I also have two matching nightstands, a 9 drawer long dresser,two matching mirrors, and a king size or daybed headboard. I don't have picutes of the dresser or the headboard but they all have the same acorn looking design on them. 

On the nightstands theres a 4 digit number stamped in red on the back. One of the numbers is 5713. I can't make out the numbers on the other nightstand, dresser, or mirrors. I couldn't find a number on the armoire. The people we got it from had a lot of money and traveled the world. Their grandaughter thinks the whole set is from the 18th century from Italy. But she isn't for sure.