This drawing seems to have begun as the careful study in lighter brown ink, with Piranesi's later edits added in the darker ink.
Drawing is on verso of a fragment of a letter with notes on the architectural elements of a church; see Stampfle catalogue entry cited below for full transcription.
On same mat as 1966.11:87; 90; 91.
Numbered at upper right, in graphite, "90".
Watermark: Bird on three mounts inside circle, over letter "M", fragment.
Morgan, Jane Norton, 1868-1925, former owner.
Morgan, Junius Spencer, 1892-1960, former owner.
Morgan, Henry S. (Henry Sturgis), 1900-1982, former owner.
Stampfle, Felice. Giovanni Battista Piranesi, Drawings in the Pierpont Morgan Library. New York : Dover, 1978, no. 88, repr.