Based on the data provided, we can observe that the coin in question has had a starting price in this auction of 12 euros and is in a conservation grade of 30 (BC+). Additionally, it has been auctioned in the past on several occasions, with closing prices ranging between 11 and 200 euros.

The average closing price of this coin in previous auctions has been 87.67 euros, while the average starting price has been 55.3 euros. This indicates that the coin has performed well in previous auctions.

Considering the current conservation grade of the coin, its price history in previous auctions, and the fact that it has sold in most of the occasions it has been auctioned, we could estimate a maximum purchase price of around 100 euros for this coin in the current auction. It is important to note that this is just an estimate and the final price could vary depending on the demand at the auction and other external factors.