It is argued that the central hole likely had a face.

https://imgur.com/1iYrBH8

https://steamcommunity.com/market/listings/440/Strange%20Sacrificial%20Stone

Taking sales from SCM in the past week, sorting sales by the most recent ones.

Item sales:

1 @ $1.90 = 0.81 keys

3 @ $2.00 = 0.86 keys

1 @ $1.61 = 0.69 keys

Dividing every sales by current key price at $2.32

Current highest buy and lowest sell orders at $1.49 and $2.87) respectively.

https://imgur.com/P5t47yj

No sales are omitted since they are between those ends.

Taking price from sales for a range of 32.44 - 40.33 refined (converted from keys).

Link to the bot.tf stats page:

https://bot.tf/stats/item?def=30904&q=11&ef=&craft=1&aus=0&ks=0

P.S. Price gap is kind of large but so are SCM sale prices in the past month.