I have spent some time today looking at several pieces of my own Wedgwood glass in what I have always referred to as Amber, mainly because I can see no discernible difference apart from, as you say Paul, the thickness of the glass itself. I have seen a much lighter honey tone (it was a Labrador type dog) in Wedgwood glass, that I have always assumed was the Topaz that is often referred to in descriptions, but now on looking at Thistleblower's site where there are a number of pieces in this Amber/Topaz colour way, I note that they refer to this colour as Topaz, and there is only one piece they call Amber, it is a seal, and in the picture it looks to be no different to the Topaz!
So at the moment, the jury is out as to the correct name for the colour, but I have written to ask if there is a difference and will come back with any answer I get.
As to the conclusion that Emmis Dolphin is not a second, this is because I can see no reason for it to be classified as such. It looks perfect, and the absence of a Wedgwood England sand blasted name on the pontil mark is not unusual. Many Wedgwood pieces had both the mark and a label, others were just labelled and these very often were removed either purposefully or accidentally by fastidious owners, who may have felt that the label spoiled the look of what, after all, was bought as a display ornament in the first instance. It is only now that we. as collector.s covet a label as proof of identity....although that is not always the case, but that is a different tack that we have all discussed before.