Envelope from St. Thomas to Petersburgh, New York, USA. Great Britain 4d Queen Victoria vermilion plate 14, duplex 'C51' 'ST-THOMAS - PAID - A MR4 76' and postmarked on arrival 'NEW-YORK / DUE 5 CTS. / MAR 18', unusually sharp and clean postmarks, postal rate 4d with RMSCP.