What color is Letterhead, Educational Audio Visual, Inc., Pleasantville, NY, 1960 ?

Source Crayola® CSS3 CSS4
#413f43
 
#414a4c
outer space
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey
#86899c
 
#95918c
gray
#778899
light slate grey
#778899
lightslategrey
#515c8d
 
#58427c
cyber grape
#483d8b
dark slate blue
#483d8b
darkslateblue