Promicroceras multi-bed in limestone from the Lower Lias of Charmouth, Dorset, UK.
Matrix: Moderate limestone, well consolidated. Approx. 95x55mm
Difficulty: ★ ★ Moderate. Relatively easy to clean. Engraver or an air pen (air scribe).
From the top view you can easily miss one of the larger proms, it is more clearly visible in side view. The prom beside it has the edge missing and is hollow, but the walls are thick enough that it should be OK. Four obvious ammonites, possibly others inside.