A heavy Paleolithic hammerstone / bone-crushing tool made from compact iron jasper. The piece shows strong, repeated percussion damage with characteristic concave impact zones, step fractures, and organized flake removals from a consistent direction. These features indicate deliberate shaping and intensive use as a heavy-duty tool for bone processing or hard organic material. Provenance: Found in the Netherlands (river terrace gravels). Stone objects of this prehistoric type have been collected and held in private collections in the Netherlands since before 1999. This specific item was acquired directly by the current owner in 2024–2025, the Netherlands, and has since formed part of a private collection. From the private collection of H.L., the Netherlands. Legally obtained from publicly accessible river gravel deposits with no protected archaeological context. No excavation was carried out. No permit or authorization from the Cultural Heritage Agency of the Netherlands (RCE) is required for ownership or sale. The item will be shipped well-protected, with tracking number and insurance. Fast and secure international shipping.