From: The Gentleman's Magazine, and Historical Chronicle. Volume XXXVIII for the Year M.DCC.LXVIII. 
Improvement in constructing and rectifying Hadley's Quadrant. 
Curious account of an inedited Coin of Antonius, one of the 12 celebrated coins of M. Lefroy. pp. 55-56.
Engraving on laid paper, fold as issued, torn from the book, wear, tears. 
Sheet 8 3/8" x 10 1/2".
Provenance:  The Estate of George "Yorgo" Demetrakopoulos; professor, assistant director of the Medieval Institute, and assistant to the dean at Western Michigan University, Kalamazoo, Michigan, from 1965-2000.
British School XVIII C.