This triangular 40 kuna stamp was issued in 1943 by the Independent State of Croatia (Nezavisna Država Hrvatska, N.D. Hrvatska) during World War II. The design features a botanical illustration of bright yellow flowers with green stems against a violet-blue background, framed by a distinctive triangular format. Part of a floral-themed series, these stamps were both visually striking and symbolized natural beauty during a turbulent historical period. Triangular issues from this era are especially sought after by collectors of wartime and Balkan philately.