Fine engraving of various European nautical flags. The background colors seem to follow a pattern where vertical stripes denote red and horizontal stripes blue. Black dots over white seem to represent yellow or gold.
The engraving appeared in the seventh volume of Receuil de planches, sur les sciences, les arts liberaux, et les arts mechaniques, avec leur applications, part of Diderot's monumental Enlightenment-era Encyclopedie. Signed "AG. sc.", and with a notation in the top margin indicating the volume in which it appeared, this was likely from the second edition published in Lucca by Vincent Giuntini.
According to the text, the flags are:
107. Russian pennant
108. Royal flag of Poland
109. Flag of Poland
110. Flag of Sicily
111. Flag of Messina
112. Galley flag of Sicily
113. Flag of the Two Sicilies
114. Flag of Naples
115-117. Flag of Malta
118-119. Flag of Savoy
120-122. Flag of Venice
123-124. Flag of Tuscany
125. Flag of Genoa
126. Flag of Monaco
127. Flag of Modena
128-129. Flag of Ragusa
130. Royal flag of Brandenburg
131-134. Flag of Brandenburg
Skrifter. Norway: Griegs bogtrykkeri., 1919.
Schwab, Richard N.., Lough, John. Inventory of Diderot's Encyclopédie. Switzerland: Institut et Musée Voltaire, 1984.