Based on the data provided, we can observe that the coin in question has performed well in previous auctions. The current starting price is 25 euros, with a conservation grade of 70 (MBC-).

In previous auctions, the coin has had the following prices:

- In the auction on November 13, 2019, the coin had a starting price of 12 euros, an estimated price of 20 euros, and a final price of 35 euros, with a conservation grade of 70 (MBC-).
- In the auction on July 3, 2014, the coin had a starting price of 15 euros, an estimated price of 25 euros, and a final price of 30 euros.

Considering these historical data and the current starting price, as well as the conservation of the coin, we could estimate a maximum purchase price around 40-45 euros. It is important to note that the final price may vary depending on the demand at the auction and other external factors.