Based on the data provided, 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 final prices.

The average starting price of this coin in previous auctions has been 44.91 euros, while the average final price has been 95.22 euros. Regarding the previous prices of this coin, we can see that they have varied significantly throughout the auctions, with estimates ranging from 6 euros to 250 euros.

Given that the current conservation grade of the coin is 70 (MBC-) and considering the previous auction prices, as well as the current starting price, we could estimate a maximum purchase price of around 120 euros. This estimation is based on the trend of previous prices and the conservation grade of the coin in question.