Based on the provided data, we can see that the coin in question has a grade of 80 (MBC+), indicating that it is in fairly good condition. Additionally, it has been auctioned in the past on several occasions, with varying starting and final prices.

The average starting price of this coin is 34.22 euros, while the average final price is 45.47 euros. We can also observe that in one of the previous auctions, the coin reached an estimated price of 1141.45 euros, suggesting that its value can be significantly high under certain circumstances.

Considering that the coin will be auctioned soon and taking into account its price history, condition, and demand, as well as the fact that it has been sold multiple times in the past, we could estimate a maximum purchase price around 60-70 euros. This range is based on the average final price, the coin's condition, and the highest price reached in a previous auction. However, it is important to note that the final price will depend on various factors, such as competition in the auction and the interest of potential buyers.