Based on the provided data, we can observe that the coin in question has had varying starting and final prices in previous auctions. The current condition of the coin is estimated at 30 (BC+).

The starting price for the upcoming auction is 12 euros, with a historical average starting price of 24.93 euros, and a historical average final price of 41.58 euros.

Taking into account the previous prices of the coin, its current condition, and the fact that it has been auctioned 14 times in the past, we can estimate a maximum purchase price of around 40-45 euros. Given that the starting price is 12 euros, it is possible that the coin may fetch a higher final price this time, possibly exceeding 45 euros.

It is important to note that the final auction price may vary depending on the demand at the auction and the competition among potential buyers interested in the coin.