Just a few friendly comments. Only my own views, of course.
On a par with the Vasart butterflies, has to be Willie Manson and John Deacons
I'm not sure what you mean by "Vasart butterfies" Simone. From the context I think you probably meant Paul Ysart butterflies? And that would make sense of Wille Manson's being on a par with them. In fact, in some cases I think Willie actually exceeded Paul's qaulity in his butterflies and dragonflies! As for butterflies etc from John Deacons, I think that some are very good, but not of the quality of Willie Manson.
Adam said, about the Dragonfly Pin Dish,
... thought to be by W Manson - or Strathearn - actually I contacted Willy and his son said he recognised it as his Father's work - under Paul
"Under Paul" - Iteresting! I would have guessed the Pin Dish was made after Willie had left Paul Ysart's Harland works and most likely his from his independent years 1979 - 1981.
And, in a light-hearted moment, comments were made on ... swapping Ysart butterfly weights with those of 19th century Baccarat. Well, I would like to have a good antique Baccarat butterfly - particulalry one hovering over a double-clematis, or even better, over a bouquet of three flowers and a bud or two. But to be honest, I have always found the eyes on the Baccarat butterflies to be overly large and a bit "glaring". So on that basis, although such weights may command many thousands of £ or $, I actually prefer the Paul Ysart ones!
Finally, it is interesting to note that for insurance values some of my Ysart weights are now on a par with many of the antique Baccarat pieces!