Based on the provided data, we can observe that the coin has had an average starting price of 12.68 euros and an average auction closing price of 20.93 euros in previous auctions. Additionally, it has been auctioned a total of 83 times in the past, out of which it has been sold 72 times.

The condition of the coin on this occasion is described as "100 (Uncirculated)", indicating that it is in excellent condition.

Some of the previous prices for this coin have ranged between 9 euros and 85 euros, with price estimates ranging from 15 euros to 70 euros.

Given that the coin is in excellent condition and has performed well in previous auctions, we could estimate a maximum purchase price around 80 euros. This takes into consideration the upward trend in closing prices and the demand for this particular coin.