If the seller's description is to be believed (and to be honest, we don't know for sure if it's correct and there's little evidence offered outside of the seller's opening statement), this is a Hille midcentury sideboard by Robin Day.
To be fair it does have the look of other similar sideboards we have seen, but as ever with large designer purchases, it's always buyer beware. Saying that, it's a stylish unit, made of teak with black enamelled doors, aluminium handles and three internal adjustable shelves within the 6ft unit.
Described as being in 'good vintage condition' with 'only a few surface marks consistant with age', you can bid for this midcentury piece if you have £500 to spare.