Based on the data provided, we can observe that the coin in question has had varying starting and final prices in previous auctions. The current starting price is 300 euros, with a conservation grade of 70 (MBC-).

Some previous prices for this coin have ranged between 180 and 400 euros as starting prices, with estimates ranging from 250 to 600 euros, and final prices ranging from 230 to 1200 euros. The conservation grades of coins auctioned in the past have varied between 70 and 90.

Given that the average final price has been 478.33 euros, and considering that the conservation grade of the current coin is 70 (MBC-), we could estimate a maximum purchase price around 500 euros. However, keep in mind that the final price in an auction can depend on various factors, such as demand at that specific moment, competition from other bidders, among others.