Based on the data provided, we can observe that the coin in question has had an average auction closing price of 143.69 euros in previous auctions. Additionally, its condition has been described as 95 (UNC-), indicating that it is in fairly good condition.

Considering that the starting price for the next auction is 150 euros and the historical average closing price is 143.69 euros, we could estimate a maximum purchase price around that value. However, taking into account that the coin has been sold in the past for prices higher than 150 euros, we could consider an estimated maximum purchase price of around 160-170 euros, considering the condition and demand for this particular coin.

It is important to note that the final auction price may vary depending on factors such as competition from other bidders, interest in the coin at that specific time, and buyers' willingness to pay a higher price for a coin in good condition with a history of successful auctions.