This is a Mexican fiscal (revenue) stamp issued in 1909, denominated at 20 pesos. The design features the inscription “Control del Talón – Año 1909” in blue-green, with a large bold control serial number (05363) printed in black at the top. Such stamps were used for tax control on patents, direct contributions, and guides, with the note indicating that the stub (talón) remained in the revenue office (“Que queda en la oficina recaudadora”). It bears a purple cancellation mark, signifying official use. These stamps were not for postal purposes but strictly for fiscal accounting, making them an important collectible in Mexican revenue philately.