A scarce and fine example of Koeberle’s trocar for ovariotomy as described and illustrated in his Maladies des ovaries et de L’ovariotomy - page 568, figure 132.  His design improved on that of Pean’s by the addition of two shielded retention hooks and a lock for securing the internal trocarwhen fully withdrawn.  Unsigned, nickel over brass, and in VFC.