Based on the data provided, we can observe that the coin in question has had an average auction closing price of 67.89 euros in previous auctions. Additionally, its current condition is 95 (UNC-), indicating that it is in quite good condition.

Considering that the starting price for the next auction is 10 euros and the historical average starting price is 50.5 euros, we can see that the closing price has been significantly higher than the starting price in most of the previous auctions.

Given that the coin has been sold in the past in 19 out of the 24 auctions it has participated in, and its condition is high, we could estimate a maximum purchase price around 70-80 euros, considering the upward trend in closing prices and the good condition of the coin.

It is important to note that the final auction price may vary depending on the demand at that specific moment, so it is advisable to pay attention to the auction to adjust the offer accordingly.