Dilly duck, seems to have been coined by the collectors of Whitefriars ducks and is often used on the Whitefriars forum. I have no idea if other collectors of ducks (not Whitefriars) also use the term. All I will say is that there have been several threads on ducks on the Whitefriars forum over the last few months using the "dilly duck" expression. The seller g4glass or whatever he is called is actually a member of that forum. He does not contribute, just seems to watch. Hence the various "terms" he uses on his listings, the way he describes the colours etc. He has a lot of genuine Whitefriars on sale, usually VERY overpriced, but these items are usually in the background of the photos of non Whitefriars glass..hence giving a novice collector the feeling that they are safe in believing that an "amethyst" or meadow green" vase is indeed Whitefriars when it is not. All seems despicable to me. All seems like a scam. Ebay don't care of course, they are getting his fees which must be considerable as he regularly lists 100 or more pieces at a time. He buys( for example) a Riihimaki vase, properly attributed and re-lists it as Whitefriars at twice the price I could go on, and on and on............I think you get the picture. All this is fact, not a figment of my imagination, there's been many a thread on the W/F about this person and his listings.