Based on the data provided, we can observe that the coin in question had a starting price of 12 euros in the current auction, with a conservation grade of 25 (BC). Additionally, it has been auctioned eight times in the past, with an average starting price of 25 euros and an average closing price of 45 euros.

When analyzing the previous prices of this coin, we can see that it has had significant variations in its auction values. For example, in the auction on 2019-09-19, it had a starting price of 25 euros, an estimated price of 40 euros, and a closing price of 48 euros, with a conservation grade of 80 (FDC).

Considering these historical data and the current conservation state of the coin, as well as its starting price in the current auction, we could estimate a maximum purchase price around 40-50 euros. It is important to note that the final price will depend on factors such as demand in the auction and the willingness of buyers to bid for this particular coin.