FYI, the piece you found online, although it may be the same shape, is not the same material. It is described as Parian, which is a type of unglazed ceramic. Your piece is shiny, and has been glazed. Does your piece have as much detail in the shape as can be seen in the B&W picture, and does it have the textured background behind the eagle?
https://en.wikipedia.org/wiki/Parian_ware
Alamy is a website that offers stock photos, for people to use if they pay a licensing fee. The captions are not necessarily reliable information. I would take that information as a possible starting point, but you need to find a better source.
I can't be sure, but its possible that Alamy picture came from this website. Unfortunately, I can't find any way to search for items on this site.
https://www.rm-auctions.com/en/past-auctions
