1928. No edition remarks. 112 pages. No dust jacket. This is an ex-Library book. Pictorial cloth covered boards. Booklet with diagrams in pocket at rear. Ex library copy with associated labels, inserts, stamps and annotations. In German. Pages remain bright and clean with minimal tanning and foxing. Binding remains firm. Boards have light shelf wear with minor corner bumping and crushing to spine ends. All surfaces tanned and sunned, particularly spine.