This stone with ichthyosaur rib bione comes from the upper Jurassic (Malm) from Kordigast near Burkunstadt, Oberfranken in Germany.
The rib measures about 7 cm. The stone is unbroken, it measures around 12 x 6.5 x 3.5 cm, and there is also a fragment of an ammonite on the backside.
Interesting specimen from an unusual German location.
No manipulations.