Based on the data provided, we can observe that the coin in question has had an average auction closing price of 266.55 euros in previous auctions. Additionally, its condition has been described as 70 (VF-), indicating that it is in an acceptable but not excellent condition.

Considering that the starting price for the next auction is 75 euros and the historical average starting price has been 165.42 euros, we can infer that there is an upward trend in the prices of this coin in auctions.

Given that the condition of the coin is 70 (VF-), and considering previous closing prices, we could estimate a maximum purchase price of around 280-300 euros for this coin in the next auction. It is important to note that this is just an estimate and the final price may vary depending on demand and other factors in the auction.