https://backpack.tf/classifieds?item=Eye-See-You&quality=11&tradable=1&craftable=1&australium=-1&killstreak_tier=0

Buy orders start at 15 ref.

Sell orders start at 45.66 ref.

Bot.tf Sales:

https://ibb.co/n1DVxSc

3 Sold for 37 ref.

2 Sold for 31.11 ref.

1 Sold for 38 ref.

1 Sold for 38.11 ref.

1 Sold for 31 ref.

Marketplace.tf Sales:

https://ibb.co/PQyc1QL

6 Sold for $1.50/ 1.87 = 38.77 ref.

2 Sold for $1.70/ 1.87 = 43.88 ref.

1 Sold for $1.78/ 1.82 = 45.22 ref.

Excluding all other sales due to them being either too low for current buy orders or too high for current sell orders. Going with 31 - 38.77 ref. Ignoring the sales for over 38.77 ref due to them being outlier sales compared to the vast majority, and I also don't want the range to be spread too wide.