Nathan furniture comes up regularly in auctions and on ebay, some of the later pieces have fallen out of favour a little, notably the 70's/80's squared door pieces and the numerous highboards and shelving units.
Some of their items though, the 'Circles' sideboard for example, are absolute classics, and take a look at this catalogue, proving that Nathan were once pretty forward thinking, especially in the areas of sideboard and leg design. These designs obviously owe something to G-Plans ebonised legged Tola range, but lovely nonetheless.
Dating from the late 1950's, possibly early 1960's, the colours and drawings have aged particularly well, if it helps you identify a particular piece, all the better.
Get in touch if you have something similar to sell and, for more mid-century gems, have a look at Space Harrogate and Space Vintage Home