Based on the data provided, we can observe that the coin in question has performed well in previous auctions, with final prices exceeding the starting price and estimated price in most cases. The coin's condition is rated high, with a score of 95 (EBC+).

The average auction price of the coin has been 18 euros, with an average starting price of 10.73 euros. In the last recorded auction, the coin was auctioned off for 50 euros, significantly surpassing the estimated price.

Considering these data, as well as the upward trend in auction prices, and taking into account the high condition of the coin, we could estimate a maximum purchase price around 55-60 euros for the upcoming auction. It is important to note that the final price may vary depending on demand and other factors at the auction.