They have four Longchamp stores down under. They all happen to be on the eastern side of the continent however. No surprise really :).
Sydney
Longchamp Queen Victoria Building
455 George Street, Ground Floor, Shop 16
Sydney NSW, 2000
Phone: +61 292 610 173
Longchamp MLC
Corner King & Castlereagh Street, MLC Centre
Sydney NSW, 2000
Phone: +61 292 325 173
Melbourne
Longchamp Collins Street
115 Collins Street, Ground Floor
Melbourne VIC, 3000
Phone: +61 396 637 828
Brisbane
Longchamp Brisbane
202 Edward Street, Tattersalls Arcade
Brisbane QLD, 4000
Phone: +61 733 332 660
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