Based on the provided data, we can see that the coin in question has a conservation grade of 70 (MBC-), with a starting price in the last auction of 60 euros, an estimated price of 100 euros, and a final price of 170 euros.

Considering that the average starting price is 52.5 euros and the average final price is 122.5 euros, we can observe that the coin has performed well in previous auctions.

Given the relatively good conservation grade of the coin (70) and considering the history of previous prices, we could estimate a maximum purchase price of around 150-180 euros for this coin in the next auction. It is important to note that the final price will depend on the demand at the time of the auction and other factors that may influence the valuation of the coin.