Based on the provided data, we can observe that the coin in question has had a starting price in the current auction of 30 euros, with a conservation grade of 70 (MBC-). Additionally, it has been auctioned in the past on several occasions, with varying starting and final prices.

The average starting price of the coin in previous auctions has been 55 euros, while the average final price has been 76.25 euros. In past auctions, the estimated price of the coin has ranged between 40 and 150 euros, with final prices ranging from 25 to 190 euros.

Given that the current conservation grade of the coin is 70 (MBC-) and considering the prices from previous auctions as well as the current starting price, we could estimate a maximum purchase price 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 buyers' decisions.