Based on the data provided, we can observe that the coin in question has had an average auction price of 51.18 euros in previous auctions. Additionally, the condition of this coin has been described as '80 (MBC+)'.

Considering that the condition is good but not excellent, and that the average auction price has been 51.18 euros, we could estimate a maximum purchase price around 60-65 euros. This is because the coin has performed well in previous auctions and its condition is acceptable.

It is important to note that the final auction price may vary depending on factors such as demand at the time of the auction and the willingness of buyers to bid on the coin.