I believe the correct number is 3537, a vase produced in the 60's, originally in neon blue. I haven't found a reference to this colour. I'd guess it's fairly rare as nobody has replied to this thread yet. I certainly haven't seen one in my quite limited experience. It was produced the same time as that other neon blue, but more common, piece with the large flattened rim. Value? Who knows right now, but Wirrkala is always popular so I'd expect it be a respectable price, certainly over 60 pounds.
Hope this helps.