Based on the data provided, we can observe that the coin in question has had a starting price in the current auction of 30 euros and is in 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 the coin in previous auctions has been 56.96 euros, while the average final price has been 77.1 euros. Regarding the previous prices of this coin, we can see that they have ranged from 15 euros to 120 euros, with estimates ranging from 25 euros to 200 euros.

Given that the current conservation grade of the coin is 70 (MBC-), and considering the previous prices and estimates, as well as the average final price, we could estimate a maximum purchase price of around 90-100 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 the decision of potential buyers.