1866 Provisional stamp was introduced due to the Post Office Act XIV on May 1, 1866. These improvised stamps were done by taking “Foreign Bill” revenues, cutting off to the top and bottom inscriptions and overprinting the stamp “Service Postage”. The design consisted of the usual Victoria profile. 1866 2a Violet Official Provisional is thought as one of the most important Indian stamps. The used example of the 2a with inscriptions intact was sold for $19,000 at Spink auction that took place in October, 2010.