The ammonite itself has a size of 11.3 cm and sits onto its original matrix.
Matrix size : 22 x 14.5 x 7 cm

Name : Prorsisphinctes limoniticus (Buckman, 1921)
Age : Jurassic , Bajocian
Findspot : Evrecy , France

The fossil comes from a collection estate. A very nice one..