Based on the data provided, we can observe that the coin in question has had an average auction price of 137.67 euros in previous auctions. Additionally, its current condition is 70 (VF-).

Considering that the coin's condition is relatively good and the average auction price has been 137.67 euros, we could estimate a maximum purchase price around that value or slightly higher, taking into account that the coin will be auctioned in the coming days.

Therefore, an estimated maximum purchase price for this coin could be around 140-150 euros. It is important to note that this is just an estimate and the final auction price may vary depending on various factors such as demand at that specific time.