Rome's most iconic panorama — the sweeping ellipse of St. Peter's Square framed by Bernini's colonnade, with the great dome of St. Peter's Basilica commanding the skyline — is rendered here in a crisp, high-contrast real-photo silver gelatin postcard by the distinguished Roman photographer and publisher Ernesto Richter, whose numbered series documented the Eternal City with extraordinary clarity in the early twentieth century. The foreground shows the square relatively uncrowded, with an Egyptian obelisk at center and period street lamps still in place, dating the composition to the 1920s or early 1930s before Mussolini's Via della Conciliazione clearances changed the approach to St. Peter's forever. The reverse is completely unused — not a mark, stamp, or word — making this a pristine example of Richter's celebrated Roman photography series. The penciled "m1" in the lower corner is likely a dealer or collector notation.