Blessed Pius IX: Foundation Plate of a Tomb in St. Callistas Catacombs

This is a very interesting artifact from the catacombs in ancient Rome.

The plaque is from the 19th century during the 27th year of the pontificate of Blessed Pius IX (1872).

The inscription reads: 

 FRAGVMENTUM LAPIDIS

E. COEMETERIO CALLISTI

PIO IX PONT. MAX.

SACRI PRINC . A. XXVII.

It is grey marble and measures approximately 7 X 12 X 2 centimeters.