Circular dark grey metal item, with flat machined underside.The top is concave and is decorated with concentric circles. – 1992.185 (2)

Circular dark grey metal item, with flat machined underside.The top is concave and is decorated with concentric circles. – 1992.185 (2)

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Circular dark grey metal item, with flat machined underside.The top is concave and is decorated with concentric circles.

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