Based on the provided data, we can observe that the coin in question has had a starting price in the current auction of 25 euros and is in a conservation grade of 70 (MBC-). Additionally, it has been auctioned in the past on several occasions, with closing prices ranging from 13 to 320 euros.

The average starting price of this coin in previous auctions has been 75.79 euros, while the average closing price has been 129.23 euros. The conservation grade of the coin in previous auctions has varied between 70 and 95.

Given that the coin is in a conservation grade of 70 (MBC-) and considering the previous closing prices, as well as the current starting price and estimated prices in previous auctions, we could estimate a maximum purchase price for this coin at around 150 euros. This price aligns with previous closing prices and takes into account the conservation grade and historical demand for the coin in previous auctions.