Based on the provided data, we can observe that the coin in question has had an average auction closing price of 18.75 euros in previous auctions. Additionally, its current condition is estimated at 80 (VF+).

Considering that the estimated maximum purchase price is usually slightly higher than the average auction closing price in previous auctions, and taking into account the condition of the coin, we could suggest an estimated maximum purchase price around 20-25 euros.

It is important to note that the final auction price may vary depending on factors such as demand at that specific time, competition from other bidders, and particular interest in the coin in question.