It's a modern piece, but the Reflect sideboard by Soren Rose for Muuto would work a treat in a retro environment.
Takes its inspiration from midcentury and Scandinavian design, the sideboard is available in two sizes and a couple of finishes, although the natural oak works best for us.
The curved frontage is the standout design feature, with the tapered legs also worthy of a mention. There are two sizes to choose from, the largest one available from the Lollipop Shoppe, setting you back £2,590. If you want the smaller one, you can get that from the Finnish Design Shop, selling for €1,995. That retailer also has a rather nice matching set of drawers too.