This is very nice specimen, the slab with two different fossils

Bryozoa -Chasmatopora furcata (Eichwald, 1854)

and Cephalopod -Cameroceras kuckersense Balashov, 1968  (from the back side)

 The specimen was found in  Sandbian (Upper Ordovician), Kukruse stage deposits, near Narva, Estonia. No reconstruction, shipping worldwide is $30.