Early 20th-Century French Post Box w/ Blue Patina

This lovely French post box from the 1900s was created by Picard Sauerbach & Cie. It features a lovely blue patina and a cast-iron door with lock and inscriptions indicating the next mail collection date. The lock has been taken off, but the numbers can still be rotated. The "RF" letters at the top stand for "Republic Francaise."