Based on the provided data, we can observe that the coin in question had a starting price in the current auction of 125 euros, with a conservation grade of 80 (MBC+). Additionally, it has been auctioned in the past on several occasions, with varying starting and final prices.

The average starting price of previous auctions has been 166.88 euros, while the average final price has been 174.17 euros. The coin has been sold in 6 out of the 8 previous auctions.

Considering the coin's previous prices, its current conservation grade, and the fact that it has sold in the majority of previous auctions, we could estimate a maximum purchase price around 200-220 euros. This estimation is based on the fact that the final price in the current auction was 125 euros, but taking into account that it had higher starting and final prices in previous auctions, and that it has sold in most instances.

It is important to note that the final price in the current auction may vary depending on demand and other factors, so it is advisable to monitor the auction's progress to adjust the offer accordingly.