Envelope from Frederiksted 26 April 1917 to New York, USA. 2 cents US stamp cancelled with the Danish type LAP 'FREDERIKSTED 26/4 1917'. 2 Cents correspond to 10 BIT domestic rate, from 1 April 1917 DWI was US territory. Transition period from 1.4.1917 - 30.9.1917.