1930 (June 1) usage of 10k Worker brown/grey-brown Envelope uprated with 1929 Tenth Anniversary 2k x2 tied by 'MOCKBA' cds, to Mauritius but missent to Italy with largely very fine 'CAVOUR/7.6.30/(TORINO)' arrival b/s, "Ile Maurice/afrique anglaIse" underscored & "Isola L Maurizio" added in blue at L/R, 'GENERAL POST OFFICE/17JY/30/MAURITIUS' arrival b/s, minor blemishes. An outstanding origin/destination cover, greatly enhanced by first being missent.