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On the secondary market, the 4100BA typically trades between $35,000 and $55,000 depending on condition and the presence of original paperwork. A notable production detail is the transition from \"Audemars Piguet\" script to the block logo on later dials, which influences specific collector preferences for early-series aesthetics."}, "listing_stats": {"count": 209, "median": 38000.0, "low": 3650.0, "high": 750000.0, "brands": 1, "merchants": 7}, "listings": [{"id": "h_7739650343121", "title": "Audemars Piguet Audemars Piguet Royal Oak Perpetual Calendar 25810OR.OO.0944OR.01", "brand": "Audemars Piguet", "model": "Audemars Piguet Royal Oak Perpetual Calendar 25810OR.OO.0944OR.01", "reference": "0944OR.01", "price_usd": 300000.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "18k Rose Gold", "case_size_mm": 39.0, "movement": "Automatic", "complications": ["Perpetual Calendar"], "merchant_slug": "material-good", "merchant_name": "Material Good", "image_url": 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