Based on the provided data, we can observe that the coin in question had a starting price of 12 euros in the most recent auction, with a grade of 70 (MBC-). Additionally, it has been auctioned seven times in the past, always managing to sell.

When analyzing the previous prices of this coin, we can see that it has had a wide price range, from 40 euros to 550 euros. The average selling price has been 266.57 euros.

Considering the grade of the coin and the previous prices, as well as the fact that it has sold in all previous auctions, we could estimate a maximum purchase price of around 300-350 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 decision of potential buyers.