Based on the data provided, we can observe that the coin in question has had an average auction price of 114.65 euros in the past, with a conservation grade of 80 (MBC+). Additionally, it has been auctioned 60 times in the past, of which it has been sold 55 times.

Considering that the average auction price has been 114.65 euros and the coin's conservation grade is 80 (MBC+), we can estimate a maximum purchase price around 120-130 euros. Since the coin will be auctioned soon, the final auction price may be higher due to demand at that specific time.

Therefore, an estimated maximum purchase price for this coin in the upcoming auction could be around 120-130 euros, taking into account its price history and conservation.