A fine 18th century bistoury cache by Savigny used for the extraction of bladder stones.
The instrument has been well protected in its original case. The polished steel lever which opens the blade is crosshatched, as is the spring loaded release button which secures the lever within the ebony handle allowing the blade to be fixed in an open position.
There is a second adjustment possible using the pivot screw which allows the blade to be moved forwards and backwards a few mm within a steel loop. The stem is signed Zavigny [sic]. The outside of the fitted wood and sharkskin case is pristine, lined with red velvet and silk and with original hinges and catches in good working order.