This is a Mexican fiscal (revenue) stamp issued in 1909 for controlling receipts and patent records ("Control del Talón"). It is denominated 50 Pesos, printed in olive green on white paper, with a large serial number 11241 at the top for accountability. The text indicates its use for patents, direct control, and guides retained in the collecting office ("Oficina Recaudadora"). Such high-value fiscal issues were intended for legal or business documents rather than postage. A violet handstamp cancellation confirms official use.