1922. No edition remarks. 459 pages. No dust jacket. Pictorial cloth covered boards. Black and white diagrams throughout. In German. Pages with some foxing and tanning, particularly to endpapers and textblock edges. Binding remains firm. A previous owner's name to front free endpaper. Boards have moderate shelf wear with mild bumping and fraying to corners and crushing and fraying to spine ends. All surfaces tanned, particularly spine. Book has slight backwards lean.