Assertion: postcard's stamp | /r/CapableOf | become available
Facets:
value: in postal facilities
type: LOCATION
value: on may
type: TEMPORAL
Source sentences:
text: On May 6, 1840, the stamp that became known as the Penny Black, covering the one-penny charge for half-ounce letters sent anywhere in the British Isles, became available in postal facilities.