Based on the data provided, we can observe that the coin has had an average auction closing price of 144.14 euros in previous auctions. Additionally, it has been auctioned a total of 25 times in the past, with an average starting price of 74.88 euros.

The condition of the coin this time is 25 (BC), which indicates that it is in fairly good but not excellent condition.

Considering the previous prices of the coin in past auctions, as well as its current condition, we could estimate a maximum purchase price around 160-180 euros. Given that the average closing price has been 144.14 euros and the condition is good but not excellent, an estimated maximum purchase price in that range could be reasonable.

It is important to note that the final auction price will depend on several factors, such as demand at that specific moment, competition from other bidders, and buyers' perception of the coin's value at that time.