Based on the data provided, we can observe that the coin in question has had an average auction closing price of 22.57 euros in previous auctions. Additionally, its current condition is estimated at 80 (MBC+).

Considering that the coin's condition is quite good (80), and that the average auction closing price in previous auctions has been 22.57 euros, we could estimate a maximum purchase price around that value or slightly higher, taking into account that the coin will be auctioned in the coming days.

Therefore, an estimated maximum purchase price for this coin could be around 23 to 25 euros, considering its condition and previous closing prices.