Based on the data provided, we can observe that the coin in question has had an average auction closing price of 63.89 euros in previous auctions. Additionally, its current condition is 70 (VF+), indicating that it is in an acceptable but not excellent condition.

Considering the previous prices of this coin and its auction history, as well as the fact that it has sold in 9 out of the 11 previous auctions, we could estimate a maximum purchase price around 140-150 euros. This estimation is based on the fact that it has reached closing prices of up to 85 euros in the past, taking into account the current condition and demand for this coin in previous auctions.

It is important to note that the final auction price will depend on various factors, such as competition from other bidders and interest in the coin at that specific time. Therefore, it is advisable to set a maximum purchase limit based on this estimation and your own budget.