Had a lot of fun learning about this piece. 11.5" (29cm) to top of handle. Concave Polished pontil. The surface texture feels rough and sharp. There is frit in the glass. Ingrained dirt in the joints between the jug and the applied handle (I will probably clean it out when it is being rehomed). The glass is not perfectly clear - it has the faintest hint of peach or citrine, barely discernible but it might be a clue.
When I bought it I thought it might be Italian and initial searches bought up a ewer attributed to Salviati, which had the same surface finish and a similar shape and rim
https://lelandlittle.com/l/salviati-aventurine-ewer/auction/339/lot/170/Trying to find out about the term "granzioli" led me to a brilliant site
https://museovetro.visitmuve.it/en/il-museo/layout-and-collections/in-depth/glass-types-and-glassmaking-techniques-19th-century/I have also seen the terms "granulari" and " granzioloni" used on some websites, but "granzioli" is the only one on that site.
Further searching lead to an image that took me to Angela's site, where I learned more about "overshot" glass
http://www.theglassmuseum.com/overshot.htmThis took the search to the USA - Boston & Sandwich Glass. I was very surprised to find that these jugs with the internal ice hole (other terms I came across during the search were "bladder" "chamber" "holder" "compartment"), were made as early as 1870. Most likely for keeping lemonade or iced tea cool, without diluting the contents.
This one on ebay has a more defined "crackle" than mine.
https://www.ebay.co.uk/itm/Atq-Victorian-1870-Overshot-Crackle-Glass-Twisted-Rope-Handle-Pitcher-Ice-Holder/273903280701This seller has listed as Czech/Bohemian - they may have seen some of the overshot pieces attributed to Harrach. I've included it here as it mentions that these pieces were not made after 1887, as it was found that the jugs were difficult to clean and, therefore, a health hazard! The seller does not give any reference for this information.
https://www.ebay.com/itm/273810367936This one has a very definite attribution to Boston & Sandwich, but the handle is distinctive and different to mine.
https://www.cooperhewitt.org/2018/02/21/chilled-but-not-diluted/There are also differences in the position of the ice hole - some jugs have it above the base of the handle and others below.
I am hoping there might be someone more knowledgeable on Boston & Sandwich glass who can confirm whether they did any of these jugs with such a, relatively, plain handle. Also, whether the polished pontil would be right for B&S, as I have only found examples with rough pontils where a photograph of the base is available.
Thank you!