regret I don't possess such a decanter, unfortunately - it was a book image only of which I was speaking, and I can't copy that. I'd suggest that the examples you've been looking at are, as you suggest, very late Victorian/Edwardian. You may have difficulty in progressing any sort of attribution much further - I take it that there's no sign of a backstamp of any kind. Do the digits look Continental, or very British - there is a difference in the style of script which sometimes is noticable.