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The median series is descriptive asking-price intelligence, not an appraisal or completed-sale index.","observations":23,"sample_listings":19,"slug":"birkin-40-black","status":"ok","summary":"Birkin 40 Black median ask is up $510 (2.32%) since 2026-05-30."},"license":"Public citation dataset. Attribute BirkinBagStock.com and verify merchant prices before purchase.","slug":"birkin-40-black","source":"BirkinBagStock.com","title":"Birkin 40 Black \u2014 Live Inventory Across 12 Merchants","url":"https://birkinbagstock.com/price-history/birkin-40-black"}