This is a wonderful rare old thing. A signature on the lock plate confirms what we'd hoped. It's a chocolatier's presentation box, 19th century, from arguably the very top name in 19th century confections, chocolatier "Maison Boissier" (House of Boissier). Yes, chocolate was a rare expensive commodity then, only for the very well-to-do. The Maison Boissier began in 1827, and is still an honored name in French confections today. We've added a screen shot of the company's online shop. The boxes that can be found are in a myriad of styles and materials over the centuries. These early ones meant to be kept as the souvenir of the giver once the confections boxed within had been consumed. We've had amazing Boissier boxes over the years, and the last one we offered was purchased by the Boissier Museum, Paris. We've had them in tortoise shell, to beautifully hand painted paper-covered card boxes. A fascinating collection item, anyone who truly loves chocolate can certainly understand the opulence of the boxes to which these early chocolatiers placed their gems of confectionary elegance. Their first counter, store was on the Boulevard des Capucines. The lock appears to work, but we do not have the original key. We'll search our stash of spare antique keys in case we can match one, but at listing time there is not a key. The lock plate bears the engraved signature we look for: "Maison Boissier".