Blaze noted the the 7.55 physical sale was high given SCM sellers. Buy order sales may also be a bit low (you could also say removing both of these 'balances' the range).

SCM uncraftable sales: https://steamcommunity.com/market/listings/440/Strange%20Cleaner%27s%20Carbine?filter=crafting

Although technically it's not possible to differentiate between craft and uncraft sales here, I would presume the uncraft versions would sell a bit higher due to rarity and such. Taking current sales around the current lowest selling prices of the uncrafts as seen in the link above.

This would give us 0.089*59.17=~5.33ref and 0.0746*59.17=~4.33ref as an approximate range.

4.33-5.33 ref