This 15 Heller red stamp from Austria forms part of the 1916 definitive series issued after the accession of Emperor Karl I. Engraved with fine detail by A. Cossmann, it presents a left-facing profile of Karl I surrounded by an ornate imperial frame typical of the late Austro-Hungarian postal style. Printed in a rich carmine shade, the issue is valued by collectors for its historical connection to the final years of the Empire and for its clean classical typography. Well-centered examples with intact perforations remain particularly desirable in philatelic collections.