Malta. 1918. Registered Office mail envelope headed 'On His Majesty's Service' addressed to England bearing SG 42, 3d grey and purple and 'War Tax' SG 92, 1/2d green (block of four) and SG 93, 3d grey and purple tied by Malta date stamp with framed 'R/ Valletta/ No 167' hand-stamp in carmine with oval 'Registered/ Malta' and Reading arrival. Very fine.