Based on the data provided, we can observe that the coin in question has had an average starting price in previous auctions of 67.14 euros, while the average closing price has been 86.67 euros. Additionally, it has been auctioned a total of 7 times in the past, being sold in 6 occasions and not sold in one.

The conservation of the coin is described as 70 (MBC-), indicating a conservation level between Very Fine to Fine.

When analyzing the previous prices of this coin in past auctions, we can see that it has had estimated values ranging from 90 to 200 euros, with closing prices ranging from 60 to 95 euros. The conservation rating has remained constant at 70 in previous auctions.

Given that the coin will be auctioned soon with a starting price of 25 euros, and considering its price history and conservation, as well as the demand it has had in previous auctions, my estimated maximum purchase price for this coin would be around 110 euros. This price falls within the range of estimated prices in previous auctions and takes into account the conservation and market demand.