Based on the data provided, we can observe that the coin in question had a starting price of 125 euros in the most recent auction, with a conservation value of 90 (EBC). Additionally, it has been auctioned a total of 18 times in the past, being sold in 17 occasions and not sold in one instance.

The average starting price of previous auctions has been 84.11 euros, while the average final price has been 99.76 euros. Regarding the previous prices of this coin, we can see that they have ranged from 18 euros to 150 euros, with estimates ranging from 30 euros to 300 euros.

Given that the coin is in a conservation state of 90 (EBC) and considering the previous prices and the trend of final prices, we could estimate a maximum purchase price around 200 euros. It is important to consider that this is just an estimate and the final price may vary depending on factors such as demand at the auction and buyers' interest.