Upon futher investigation, I found several mint sets of the early postwar period that had this lighter shade of H6 cord. The last time it shows up is 1950. I feel quite confident that the green cord of this color was introduced in the late prewar period as a change that was about to happen and/or as an export color to go with the med red/green( blue/gold plate) sets that we got in the colonies! I have not seen any mint sets with green cord from the late 30's or early 40's but they may exist! Anyone? The hank is 4.25" and cord is 1mm thick. Overall lengthy is about 165".