Superb set of four 'Paste Up' ESSAYS for the 1904 Provisional overprints showing trial impressions of the 'CORREOS' only overprint plus the 1c, 3c and 12c overprints struck in black and pasted onto telegraph stamps to simulate the proposed issue. An exceptional set of exhibition quality and rarity. Ex Moorhouse. (As SG 94, 98, 102 & 103)