Based on the data provided, we can observe that the coin in question has had starting and estimated prices ranging between 150 and 250 euros, with final prices ranging between 150 and 320 euros. The conservation grade of the coin is at a level of 80 (MBC+).

Taking into account the previous prices of the coin in past auctions, as well as its current conservation state, we can estimate a maximum purchase price for this coin in the upcoming auction. Considering that the average final price has been 235 euros and the current conservation grade is 80 (MBC+), we could consider an estimated maximum purchase price around 250-270 euros.

It is important to note that the final auction price may vary depending on factors such as demand at that specific moment, competition from other bidders, and the perceived value of the coin at that time. Therefore, it is advisable to pay attention to the auction and adjust the offer accordingly.