Based on the data provided, we can observe that the coin in question has had a starting price in this auction of 18 euros, with a conservation grade of 70 (MBC-). Additionally, it has been auctioned in the past on several occasions, with varying starting and estimated prices.

The average starting price of this coin in previous auctions has been 29.56 euros, while the average final price has been 47 euros. Regarding previous prices of this coin, we can see that they have ranged between 10 and 90 euros, with estimates ranging from 20 to 150 euros.

Given that the current conservation grade of the coin is 70 (MBC-), and considering the previous prices and market conditions, we could estimate a maximum purchase price of around 50-60 euros for this coin in the current auction. It is important to note that the final price may vary depending on the demand at the auction and other factors that may influence buyers' decisions.