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Regarding Auction Houses and Identification and Valuation (no names, no pack drill....): there are very few auction houses that have someone on their staff who knows much about paperweights. Many auction houses will offer an opinion, but that opinion may be 'less than accurate', to put it kindly. Usually the error is to suggest something made in Murano, China or by Caithness is antique and valuable - but they can also identify antique French or Bacchus weights as 'millefiori paperweight estimate £20 - £30'.
Even large auction houses make mistakes: one major national firm recently sent a collection of modern American weights (worth maybe £6000 - £8000) to a provincial office, where it was sold in lots of 20 weights at a time, as 'paperweights', not illustrated online or in the catalogue. Needless to say the weights sold for a lot less than the market value. And I recall a London sale recently with an obvious Murano carpet ground described as a 'unique Bacchus'. Another repeated error is 'signed by Paul Ysart with a 'P' cane'.
Some auction houses recognise the issue (which applies to all specialised areas of expertise, not just paperweights of course), and contact more knowledgeable people for advice (there are 3 auction houses who sometimes ask my advice about paperweights, for example). But these are in the minority, and have to recognise that they need to ask in the first place!
If you are selling, expect to lose 30% or more of the hammer price in commission if you sell through any of the major auction houses.
Alan