Austrian Thomas Koschat Postage Stamp on Air Mail Envelope

This item is an Austrian postage stamp featuring a portrait of Thomas Koschat, affixed to an air mail envelope. The stamp itself is rectangular, with serrated edges typical of postal stamps. It primarily features a dark brown or sepia tone, presenting a bust portrait of a man with a prominent mustache and a collared shirt, identified as 'THOMAS KOSCHAT 1845-1914'. Above him, partially obscured by the postmark, is 'OSTERREICH' and to his left, 'REPUBLIK' and the denomination '2S' (2 Schilling). At the top left of the portrait, there is a small crest or coat of arms. The stamp has been postmarked with a circular stamp bearing the date '19-5.72-' (May 19, 1972) and a numeric identifier '1180' below it, indicating its use. To the left of the Koschat stamp, another, partially visible stamp, possibly in a gold/brown hue with a '2' on it, is present. The envelope itself is an air mail type, characterized by its distinctive red and blue chevron-like borders on a light-colored, likely off-white or light grey, paper surface. The paper shows minor signs of age and handling, consistent with a used postal item. The edges of the envelope are visible, showing no significant tears or creases beyond typical postal handling. The overall condition suggests it has been preserved reasonably well for an item of its age. The craftsmanship of the stamp is detailed, showcasing fine engraving for the portrait.