It is described in the book simply as a "silver ewer".
My family has some old vases and other items made from pewter that have been plated with a thin layer of silver on the outside, but no pitcher-like object that I know of. Tin/pewter turns gray if it is exposed to cold -- it is called "tin pest".
Edit: I found the image below on a well-known auction site. I think it is very close in shape, except for the handle and spout. It is pewter. Made in Holland in 1941 (!), stands only 10" tall, though.