Possibly a Paul Beuscher stenciled horn, which were a grab-bag of Dolnets and Pierrets, mainly. Could be a Eugen Schuster Aristocrat, but I've seen enough of them to know that the G# cluster's all wrong. The post also mentions that it's got "Windsor" engraved on it, which actually was a Buescher stencil name. But, as I said, this horn isn't a Buescher.
Anyone have an opinion? The horn's at http://www.bluespeter1.de/aktuelles-tenor-alt under "Buescher Tenor Saxophon."