Based on the provided data, we can observe that the coin in question has had a starting price in the current auction of 30 euros, with a conservation grade of 90 (EBC). Additionally, it has been auctioned in the past 39 times, sold in 30 instances, and remained unsold in 9 instances.

The average starting price in previous auctions has been 27.37 euros, while the average final price has been 33.93 euros.

Upon analyzing the previous prices of this coin, we can see that it has experienced variations in its starting, estimated, and final prices throughout past auctions. The conservation of the coin has mostly been high, with grades ranging between 70 and 95.

Given that the coin is in a conservation grade of 90 (EBC) and has had previous starting prices ranging from 6 to 75 euros, with estimates between 8 and 110 euros, we could estimate a maximum purchase price in this current auction around 70 euros, considering the conservation and historical prices of the coin.