Powerhouse Museum Collection http://www.powerhousemuseum.com/collection/database/ Powerhouse Museum Collection en-au 1 1 50 91/212 Envelope, posted at Garden Palace Post Office, paper / ink, made in Sydney, New South ... http://www.powerhousemuseum.com/collection/database/?irn=115628&search=91-212&site_id=3 91/212 Envelope, posted at Garden Palace Post Office, paper / ink, made in Sydney, New South Wales, Australia, 26th February 1880 and owned by Adelaide M Smith, Boston, Massachusetts, United States of America, 31st March 1880 http://www.powerhousemuseum.com/collection/database/?irn=115628&search=91-212&site_id=3