T. Sinclair was a color lithography firm in Philadelphia, active in the mid 19th century. They printed fine color plates for book publishers as well as separately issued topographical prints.
Condition: Generally very good, the paper with the usual light overall toning, some minor scattered wear, soiling, soft creases, faint foxing. Diagonal crease from lower left to top right barely visible, not obtrusive. Later professionally backed on supporting sheet of Japanese paper.
Lehman, Harold D. “Open Windows: English Quakers View European Mennonites.” Mennonite Historical Bulletin: 1995. http://www.goshen.edu/mcarchives/MHB/Lehman.html (7 October 2002).
Whittier, John Greenleaf. “To Daniel Wheeler.” Quaker Writings. http://www.qhpress.org/quakerpages/qwhp/jgwh226.htm (7 October 2002).