Hi! KevH and SophieB, thank you both for your comments.
SophieB, your information on the historical context of this piece is by no means pedantic; it is both interesting and informative. It may help to give us some indication as to whether Bontemps’ factory could be considered as a possible contender for the production of this newel post finial. Anyway, I enjoyed reading it and learning something!!
Bearing in mind the usual location of a newel post finial, however, I do feel that a political supporter of Napoleon III would have been more likely to order a paperweight or a plaque, rather than this finial, as an item to keep out of sight as not only would his family and friends have seen it but any visitor to his home and his domestic staff as well, both friends and foes.
In addition, the very process of producing a sulphide portrait would suggest to me the making of a number of examples in a small production run, these for sale to various glass houses, not a specific commission for a one off piece.
KevH, the cane that I felt might share some similarities is the cross/bird/aeroplane cane with the pink rim on Page 61 of the 2008 PCA Bulletin. I had reasoned, perhaps incorrectly, that these and similar motifs illustrated by Kulles and others were only elements in a cane and may well have been used with different outer sheaths. The system of production used for making such canes would have enabled the glassworker to change the latter at will.
I feel that an additional problem is that, with minor distortions in manufacture, these “cross” silhouettes transform themselves from crosses to aeroplane shapes, even to birds, thus rendering their classification and attribution even more difficult. Also the mundane nature of the other canes in my piece does not help it’s attribution greatly.
KevH, your comment about Salvador Ysart, Choisy le Roi and the possibility of Salvador having access to old factory canes is fascinating and could well be a possible link between the finial and Bontemps’ factory. Thank you for that.
Nicholas