Based on the data provided, we can observe that the coin in question had a starting price of 40 euros in the most recent auction, with a conservation grade of 70 (MBC-). Additionally, it has been auctioned a total of 27 times in the past, being sold in 21 instances and not sold in 6 instances.

The average starting price of previous auctions has been 60.6 euros, while the average final price has been 72.04 euros. We can also see that the previous prices of this coin have varied in different auctions, ranging from 20 euros to 229.26 euros.

Taking into consideration these data, as well as the conservation grade of the coin and its auction history, we could estimate a maximum purchase price around 90-100 euros. It is important to note that the final price may vary depending on the demand at the auction and other factors that may influence the decision of potential buyers.