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A bottle jack. Its key is missing. It has the number '70' stamped on its underside.
This bottle jack, a tool used for short vertical lifts, is unusually large in size, but it is of exactly the same pattern as smaller varieties. Its key is missing. It has the number '70' stamped on its underside, and a device incorporating a crown and a cross is stamped on the disk which covers the key hole.

1 bottle jack: metal