Based on the provided data, we can observe that the coin in question has had a starting price in the current auction of 175 euros and is in a conservation grade of 80 (MBC+). Additionally, it has been auctioned 27 times in the past, sold in 26 instances, and remained unsold once.

The average starting price of previous auctions has been 123.21 euros, while the average final price has been 176.31 euros. Regarding the past prices of this coin, we can see that it has had variations in its starting, estimated, and final prices over the years, ranging between 90 and 200 euros.

Given that the conservation grade of the coin is 80 (MBC+), and considering the upward trend in final prices in previous auctions, as well as the fact that it has sold in the majority of instances in the past, we could estimate a maximum purchase price around 200-220 euros for this coin in the current auction. It is important to note that this is just an estimate and the final price could vary depending on demand and other factors in the auction.