Based on the data provided, we can observe that the coin in question has had an average auction closing price of 72.41 euros in previous auctions. Additionally, its current condition is 80 (MBC+).

Considering that the coin's condition is quite good and the average auction closing price has been 72.41 euros, we could estimate a maximum purchase price around 80-85 euros. Given that the coin will be auctioned soon, it is possible that the closing price may be slightly higher, so an estimated maximum purchase price could be 85-90 euros.

It is important to note that the final auction price will depend on the demand at that specific moment, so it is advisable to pay attention to the auction to adjust the offer accordingly.