Name: "Antique Omani pounder" ?
Period: Second to third millennium BC (according to Al Ain museum based on findings Um-an-nar ) to around 1500 ( based on one archaeological find at Julfar). The pounder from Julfar is about 10 cm longer than this pounder and the pounders in the Al Ain Museum, but the shape and material seems identical.
Origin: Oman (similar item discussed in the archaeological excavations at Julfar). Purchased in Nizwa (old copper souq) early 1980´s.