Based on the provided data, we can observe that the coin in question has had a starting price in the current auction of 150 euros, with a conservation grade of 75 (MBC). Additionally, it has been auctioned in the past on several occasions, with closing prices ranging between 90 and 220 euros.

The average closing price of the coin in previous auctions has been 154.44 euros, while the average starting price has been 131.82 euros. Considering that the coin has been sold in all previous instances, we can infer that there is interest from collectors in this particular coin.

Given the current conservation grade of 75 (MBC) and considering the previous closing prices as well as the demonstrated interest from collectors, we could estimate a maximum purchase price of around 200 euros for this coin in the current auction. It is important to note that this is just an estimate and the final price may vary depending on demand and other factors in the auction.