Based on the data provided, we can observe that the coin has performed well in previous auctions. The current starting price is 25 euros, and the coin's condition is estimated at 70 (MBC-), indicating that it is not in perfect condition but also not in the worst condition.

In previous auctions, the coin has reached closing prices of 85 and 130 euros, with estimated prices of 90 and 150 euros respectively. Additionally, the average closing price is 83.33 euros.

Considering that the coin has sold in all previous auctions, and taking into account its price history, condition, and demand, we could estimate a maximum purchase price around 140-150 euros. This is considering that the current starting price is 25 euros and the average closing price is 83.33 euros, as well as the upward trend in previous closing prices.

It is important to note that the final auction price will depend on the demand at that specific moment, so it is advisable to monitor its evolution.