All eleven postmasters that issued provisional stamps used, as far as is known, local engravers and printers to prepare the stamps. The postmaster provisional stamps and envelopes all became invalid on July 1, 1847 when our first general issue, the 5¢ and 10¢ 1847 stamps, were placed on sale. However, there are a few New York provisional stamps on cover postmarked after July 1, 1847. In addition, there is one used off cover Brattleboro stamp used after the cut off date and there could be other late usages of which I have no record.