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The
British Leeward Islands - Antigua, Dominica, Montserrat, Nevis, St. Christopher (St.
Kitts) and the Virgin Islands - all
used postage stamps inscribed "LEEWARD ISLANDS" between 1890 and 1
July 1956, often concurrently with stamps inscribed with the colony's name.
http://en.wikipedia.org/wiki/Leeward_Islands

Scott: #128P
(CD308)
Issued: 10.10.1949
UPU Issue
Inside #128: Stamp on Envelope
Best website related:
Sandafayre – Stamp Atlas
http://www.sandafayre.com/atlas/carrib.htm
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