Based on the data provided, we can observe that the coin in question has had an average auction closing price of 190.38 euros in previous auctions. Additionally, its current condition is estimated at 80 (VF+).

Considering that the starting price for the upcoming auction is 70 euros and the coin's condition is relatively good, we could estimate a maximum purchase price around 200-220 euros. This estimation is based on the fact that the average auction closing price in previous auctions has been significantly higher than the current starting price, indicating interest and demand for this coin.

However, it is important to note that the final auction price may vary depending on factors such as competition from other bidders, the exact condition of the coin, and other elements that may influence collectors' valuation.