Based on the data provided, we can observe that the coin in question has had a starting price in the current auction of 80 euros and is in a conservation grade of 80 (MBC+). Additionally, it has been auctioned in the past on several occasions, with closing prices ranging between 45 and 105 euros.

The average starting price of previous auctions has been 65 euros, while the average closing price has been 85.54 euros. Regarding the previous prices of this coin, there is a variation in starting, estimated, and closing prices over the years.

Given that the estimated purchase price in the current auction is 80 euros and considering the previous closing prices, as well as the conservation of the coin, we could estimate a maximum purchase price around 110-120 euros. This is based on the fact that the highest closing price was 105 euros in the past, taking into account the conservation of the coin.

It is important to note that the final auction price may vary depending on the demand at that specific moment, so it is advisable to pay attention to the auction to adjust the offer accordingly.