I see you are new around here in suggesting unusual prices, but when you are suggesting you need to find some proof. Proof means showing us sales, by providing links of screenshots of the sale or backpack.tf backpacks compariting between different times. Try looking at past accepted suggestions to see how to format the suggestion. Its not easy to do unusuals, but you can learn it, just read these guides, there are a lot of them out there! :)

http://backpack.tf/rules

http://backpack.tf/help/suggestions

http://forums.backpack.tf/index.php?/topic/7-how-to-create-a-good-unusual-price-suggestion/

http://forums.backpack.tf/index.php?/topic/6033-new-unusual-price-suggestion-guide-the-cheat-sheet/

https://www.youtube.com/watch?v=OwSKD9gN_Zg

If you have any questions about suggesting prices, feel free to ask any experienced suggester, they will answer you and help you with your suggestion.