Based on the data provided, we can observe that the coin in question has had varying starting and final prices throughout previous auctions. The condition of the coin this time is described as '75 (VF).'

The average starting price of previous auctions was 154.24 euros, while the average final price was 214.15 euros. The coin has been auctioned eight times in the past, selling on seven of those occasions.

Given that the condition of the coin is described as '75 (VF)' and considering the previous auction prices, as well as the current starting price of 50 euros, we could estimate a maximum purchase price around 200-220 euros. This estimation is based on the fact that the average final price has been higher than the average starting price in previous auctions, and taking into account the condition of the coin.

It is important to note that the final auction price may vary depending on the demand at the time of the auction and other factors that may influence the decision of potential buyers.