Based on the data provided, we can observe that the coin has had an average auction closing price of 49.86 euros in previous auctions. Additionally, the current condition of the coin is 70 (VF+), indicating that it is in an acceptable condition.

Considering that the average auction closing price has been 49.86 euros and the condition of the coin is 70 (VF+), we could estimate a maximum purchase price around 55-60 euros. It is important to note that this is just an estimate and the final price at auction may vary depending on demand and other factors.

If you would like a more precise estimation, I would recommend closely monitoring the auction and adjusting your offer based on how the bidding unfolds.