Based on the data provided, we can observe that the coin in question has had an average starting price of 35.66 euros in previous auctions, with an average closing price of 81.45 euros. The condition of the coin is described as '80 (MBC+)'.

Additionally, there have been 18 auctions in the past, in which the coin has been sold 10 times and not sold 8 times. Looking at the previous prices of the coin, we can see that it has had variations in starting and closing prices over the years, with values ranging from 6.06 euros to 125 euros.

Given that the condition of the coin is described as '80 (MBC+)' and considering the history of previous auction prices, as well as the fact that it has been sold multiple times, we could estimate a maximum purchase price around 90-100 euros for this coin in the next auction. It is important to note that the final price may vary depending on factors such as demand at the time of the auction and competition from other bidders.