Based on the data provided, we can observe that the coin has had an average auction closing price of 183.67 euros in previous auctions. Additionally, it has been auctioned three times in the past and has been sold on all those occasions.

The current condition of the coin is 70 (VF+), indicating that it is in an acceptable but not excellent condition.

Considering the previous auction prices of the coin, as well as its current condition, we could estimate a maximum purchase price around 200-220 euros. Given that the average auction closing price has been 183.67 euros, and considering the upward trend in estimated prices in previous auctions, a maximum purchase price in that range could be a prudent estimate.