Purchased in combination with Purple Energy Mining Light for 710. I attribute 400 to the GE Pencil Pusher. (Also puts it more in line with the Purple Energy Pencil Pusher - currently 400 with suggestion 450-500) No other sales for either of the two items in recent times.

https://imgur.com/I0Lkg0F

[Pencil Pusher - Green Energy - 400 Keys] Buyout was 400 https://gladiator.tf/listings/618b76fb65dbe6add2f612fe

[Mining Light - Purple Energy - 310 Keys] Buyout was 350 https://gladiator.tf/listings/618af1c5b342893b6da4afe7

In conjunction with: https://backpack.tf/suggestion/618f4cd9ab0af43cd4153b5d