Based on the provided data, we can observe that the coin in question had a starting price of 30 euros in the current auction, with a conservation grade of 75 (MBC). Additionally, it has been auctioned a total of 9 times in the past, all of which resulted in a sale.

The average starting price of previous auctions has been 19.67 euros, while the average final price has been 33.78 euros. The conservation grades of previous auctions have ranged between 70 and 80.

Analyzing the previous prices of the coin, we can see that it has had a wide price range, from 5 euros to 60 euros. The last recorded auction was on April 27, 2022, with a starting price of 9 euros, an estimated price of 15 euros, and a final price of 30 euros, with a conservation grade of 30.

Given that the coin is in a conservation grade of 75 (MBC) in the current auction and considering the previous prices as well as the average final price, we could estimate a maximum purchase price around 35-40 euros. This takes into account the upward trend in final prices and the conservation grade of the coin in question.