What color is Four Continents Plaque, ca. 1770 ?

Source Crayola® CSS3 CSS4
#433b30
 
#414a4c
outer space
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey
#615d56
 
#6e5160
eggplant
#696969
dim grey
#696969
dimgrey
#8b847b
 
#9f8170
beaver
#808080
grey
#808080
grey
#c9c3ba
 
#cdc5c2
silver
#c0c0c0
silver
#c0c0c0
silver