Based on the data provided, we can observe that the coin in question has had an average auction price of 54.31 euros in previous auctions. Additionally, it has been auctioned a total of 19 times in the past, out of which it has been sold 13 times.

The condition of the coin is described as 70 (MBC-), indicating that it is in a medium to low condition.

Considering the coin's previous prices, as well as its condition and the fact that it will be auctioned in the coming days, we could estimate a maximum purchase price around 60-70 euros. Given that the average auction price has been 54.31 euros and taking into account the condition and demand for the coin, a maximum purchase price in that range could be a prudent estimate.