Based on the data provided, we can observe that the coin in question has had an average auction closing price of 57.38 euros in previous auctions. Additionally, its current condition is estimated at 80 (VF+).

Considering that the coin will be auctioned in the upcoming days with a starting price of 25 euros and has had a maximum estimated price of 110 euros in previous auctions, we can make an estimation of the maximum purchase price.

Given that the average closing price has been 57.38 euros and the current condition is good (80), we could consider a maximum estimated purchase price around 70-80 euros. This is because the coin has reached higher prices in the past, but we also need to take into account that the starting price is 25 euros and the condition is not perfect.

Therefore, my estimation of the maximum purchase price for this coin in the next auction would be around 70-80 euros.