This item described in the Zurich Asia auction catalog as dated "CORREOS / TARLAC / 26 JUN 98" (which I have corrected above) and "reportedly the earliest recorded date of use on Luzon Island." Obviously a description error since the postal and telegraph system of the Revolutionary Government was to be established by November 10, 1898 per decree  issued by Gen. Emilio Aguinaldo on November 2, 1898. It is believed that the first stamps was issued late November or early December 1898.