What color is Drawing, Tractor, Model 5010, preliminary sketch, for John Deere ?

Source Crayola® CSS3 CSS4
#6f8b69
 
#757575
sonic silver
#808080
grey
#808080
grey
#a7ad92
 
#95918c
gray
#a9a9a9
dark gray
#a9a9a9
darkgrey
#485445
 
#414a4c
outer space
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey