Based on the provided data, the coin in question has a conservation grade of 95 (S/C-), indicating that it is in quite good condition. Additionally, it has been auctioned five times in the past, of which it was sold on two occasions.

The average starting price in previous auctions has been 8.6 euros, while the average final price has been 12 euros. In the last recorded auction, the coin was sold for 14 euros, exceeding the estimated price.

Taking into account this data, the previous price history, and the conservation of the coin, my estimation for the maximum purchase price would be around 15-16 euros. Given that the coin has shown an increase in its final price in previous auctions, it is possible that in the next auction it could reach a value close to this estimation.