Based on the data provided, we can observe that the coin in question has had an average auction closing price of 83.59 euros in previous auctions. Additionally, its condition has been described as '70 (VF-)', indicating that it is in an acceptable but not excellent condition.

Considering the coin's previous prices and its evolution in past auctions, as well as its current condition, we could estimate a maximum purchase price around 100-120 euros. Given that the average auction closing price has been 83.59 euros and considering the upward trend in estimated prices in recent auctions, a maximum purchase price in that range could be reasonable.

It is important to note that the final auction price will depend on several factors, such as demand at that specific moment, competition from other bidders, and buyers' perception of the coin's value at that time.