Based on the provided data, we can observe that the coin in question had a starting price of 45 euros in the current auction, 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 49.67 euros, while the average final price has been 77.08 euros. The coin has been sold in 12 out of the 14 previous auctions.

Considering the coin's previous prices, as well as its current conservation grade, we could estimate a maximum purchase price of around 100 euros. Given that the final price in the current auction was 76 euros, and considering the conservation grade of the coin, a maximum purchase price of 100 euros could be reasonable.

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.