WA Western Australia Australian States 1885-93 Watermark Crown CA 1/2d Green Used with 3d Dull Purple Postal Fiscal on 1893 cover from Perth to St Louis Missouri

1885-93 Watermark Crown CA 1/2d Green Used with 3d Dull Purple Postal Fiscal on 1893 cover from Perth to St Louis Missouri, tied by multiple strikes of Perth Duplexes and with circular 'PAID/L/ALL', 'NEW YORK/DEC/14', and 'SAINT LOUIS RECEIVED/DEC 16/93' backstamps