Based on the provided data, we can observe that the coin in question has had an average auction closing price of 27.34 euros in previous auctions. Additionally, the current condition of the coin is graded at 95 (EBC+), indicating that it is in quite good condition.

Considering that the starting price for the upcoming auction is 15 euros and that the estimated closing price has ranged between 16 and 80 euros in previous auctions, we could estimate a maximum purchase price around 80 euros, taking into account the condition and the history of closing prices.

It is important to note that the final closing price may vary depending on factors such as demand at the auction and the presence of potential buyers interested in that particular coin.