Based on the provided data, we can observe that the coin in question has had an average starting price of 76.13 euros in previous auctions, with an average closing price of 145.5 euros. The current condition of the coin is 70 (VF+).

Furthermore, past auctions have seen closing prices ranging from 48 euros to 320 euros, with condition values varying between 30 and 85.

Taking these data into consideration, along with the upcoming auction of the coin, we could estimate a maximum purchase price around 160-180 euros. This estimation is based on the previous average closing price and the condition of the coin, which although not the best, is also not the worst.

It is important to note that the final auction price may vary depending on the demand at that specific moment, so it is advisable to monitor the auction and adjust the offer accordingly.