Based on the provided data, we can observe that the coin in question has had a starting price of 75 euros in this auction, with a conservation grade of 75 (MBC). Additionally, it has been auctioned in the past four times, being sold each time. The average starting price in previous auctions has been 137 euros, while the average final price has been 242.5 euros.

When analyzing the previous prices of this coin, we can see that in the last recorded auction in 2019, the coin was sold for 400 euros with a conservation grade of 70. In previous auctions, final prices have ranged between 160 and 400 euros.

Given that the coin is in a conservation grade of 75 (MBC) and considering the previous final prices, as well as the average final price, we could estimate a maximum purchase price for this coin in the current auction around 250-300 euros. It is important to note that the final price may vary depending on the demand in the auction and other factors that may influence buyers' decisions.