Based on the data provided, we can observe that the coin has had an average auction closing price of 107.83 euros in previous auctions. Additionally, the coin's condition has been maintained at a level of 70 (VF-).

Considering that the starting price for the upcoming auction is 25 euros and the historical average starting price has been 70.83 euros, we can infer that there is an upward trend in the closing prices of this coin.

Given that the estimated price in previous auctions has ranged between 20 and 450 euros, and considering the condition of the coin, we could estimate a maximum purchase price of around 120-130 euros for this coin in the upcoming auction. This estimation is based on the upward trend in closing prices and the range of previous prices.

It is important to note that the final closing price may vary depending on factors such as demand at the auction and competition from other bidders interested in the coin.