Based on the data provided, we can observe that the coin in question has had an average auction price of 152.56 euros in previous auctions. Additionally, the current condition of the coin is 80 (VF+).

Considering that the condition of the coin is good and the average auction price has been 152.56 euros, we could estimate a maximum purchase price around that value or slightly higher, taking into account the upward trend in auction prices in previous auctions.

Therefore, an estimated maximum purchase price for this coin in the upcoming auction could be around 160-170 euros. It is important to note that this is just an estimate and the final price could vary depending on demand and other factors in the auction.