Based on the provided data, we can observe that the coin in question has had a starting price of 60 euros in this auction and is in a conservation grade of 70 (MBC-). Additionally, it has been auctioned in the past 20 times, sold in 17 instances, and not sold in 3 instances.

The average starting price in previous auctions has been 154.25 euros, while the average final price has been 205.71 euros.

When analyzing the previous prices of this coin, we can see that it has had significant variations in its starting, estimated, and final values over the years. The conservation grade of the coin has varied in previous auctions, ranging from 70 to 95.

Given that the coin is in a conservation grade of 70 (MBC-) and considering the previous prices of similar auctions, as well as the current starting price and average final price, we could estimate a maximum purchase price around 220-250 euros. It is important to consider that the final price will depend on the demand at the auction and other factors that may influence the decision of potential buyers.