https://marketplace.tf/items/617;5;u107

79$=38.9 keys rounding to 39

so you can use 38-39 price range here

Quicksold for 27 keys in a day

https://backpack.tf/profiles/76561198104618116#!/compare/1498694400/1498780800

http://www.tf2outpost.com/trade/29249454

Sold for 16 keys + something else, the Tossle doesn't match

https://backpack.tf/profiles/76561198085117308#!/compare/1499212800/1499299200

https://backpack.tf/profiles/76561198052017258#!/compare/1499212800/1499299200

http://www.tf2outpost.com/trade/29251666 ----- B/O was 33, was up for a week.

Sold with 5 keys for an Amaranthine Shako ----- Was used for the Shako

https://backpack.tf/profiles/76561198000738184#!/compare/1499731200/1499817600

https://backpack.tf/suggestion/596a5319cf6c75771a6dada6

So there are sales at 27(qs), 38, ~39 and that sale with the B/O of 33. You should resuggest at 33-39, which will be a refresh.