Based on the provided data, we can observe that the coin in question has had an average auction closing price of 141.76 euros in previous auctions. Additionally, its current condition is graded at 30 (BC+).

Considering that the coin has been auctioned 80 times in the past and sold 77 times, we can infer that there is considerable interest in this coin among collectors.

Given that the starting price for the next auction is 25 euros and the historical average starting price is 92.36 euros, we could estimate a maximum purchase price around 150-160 euros, taking into account the previous average closing price and the current condition of the coin.

It is important to note that the final auction price may vary depending on factors such as demand at that specific moment, competition from other bidders, and the evolution of the numismatic market.