I have a new French theory for the origins of the jug! In the Paris 1878 Universal Exhibition the famous bronze maker Ferdinand Barbedienne displayed a group of Roman inspired silver or silver plate. This was engraved and chased by a famous metal worker for the foundry Desire Attarge. I have not, however, been able to find images of this collection. I have since found a very few high quality pieces of silver by Barbedienne (eg in the Met Museum in NY) also by Attarge and by a designer Louis-Constant Sevin. See image below of a ewer or claret jug that has some of the same techniques used to make as my Askos.
If anyone has any further details on their work that might link, or not, to my piece, I would be grateful. I am particularly keen to see if the method of manufacture (see my earlier post showing the interior of the Askos) can be linked to Barbedienne.
Thank you