Based on the provided data, we can observe that the coin in question has had a starting price in the current auction of 18 euros, with a conservation grade of 70 (MBC-). Additionally, it has been auctioned in the past on several occasions, with varying starting and estimated prices.

The average starting price of previous auctions has been 46.33 euros, while the average final price has been 56 euros. The coin has been sold in 83.33% of the previous auctions.

Considering the previous prices of the coin and its current conservation, as well as the fact that it has sold in the majority of previous auctions, we could estimate a maximum purchase price around 90-100 euros. It is important to note that this is just an estimate and the final price may vary depending on demand in the current auction.