Based on the data provided, we can observe that the coin in question has had an average auction closing price of 60.12 euros in previous auctions. Additionally, its current condition is estimated at 80 (MBC+).

Considering that the starting price in the upcoming auction is 35 euros and that the average starting price in previous auctions was 54.67 euros, we can infer that the closing price could exceed 60.12 euros due to the upward trend in prices.

Given that the coin is in good condition (80 - MBC+), and considering that it has been sold several times in the past for over 60 euros, we could estimate a maximum purchase price of around 70-75 euros for this coin in the upcoming auction. It is important to note that factors such as demand at the time of the auction can influence the final closing price.