The bed looks very similar to one that we purchased from the Lexington Furniture "Long Cove" range, their "Newport Poster Bed" in midnight, it's also available in a shell finish. I know that the range is now discontinued but certain individual items are still available online - just type in "Lexington Newport Poster Bed in midnight". The four posts come in removable sections so can be reduced down to suit. We also managed to purchase two "Middleton Night Tables" to match and the "Compass" mirror. We were then able to refinish* certain items of our own to match and complete the look.
*The 'midnight' finish is a deep brown which appears black at first glance but in certain lights has a very deep rich brown tone - absolutely beautiful. Good luck, it's worth all the effort as it's an absolutely timeless ensemble - casual, yet elegant.