They're a fantasy deck by F. A. Lattmann of Germany. Lattmann is a manufacturer I haven't come across before, but I immediately took to these cards so put in a bid. They're in pretty good nick, with their gold corners all bright and shiny, but they're nowhere near as strongly-coloured as the ones on World of Playing Cards. The design is from about 1910, but my pack has a tax stamp that was in use from 1919-1923; I'm guessing that Lattmann had to use a cheaper printing process in the aftermath of the First World War.
I'm quite pleased by them. If only they didn't smell of cigarettes...