Based on the provided data, the coin in question has a starting price of 40 euros and is in a conservation grade of 75 (MBC). It has been auctioned twice in the past, selling once and not selling the other time. The average starting price in previous auctions was 38.33 euros, while the average final price was 95 euros.

Additionally, data from previous auctions of this same coin have been provided:

- In the auction on June 1, 2022, the coin had a starting price of 40 euros, an estimated price of 70 euros, and sold for 95 euros. Its conservation grade was 80.
- In the auction on February 27, 2024, the coin had a starting price of 35 euros, an estimated price of 65 euros, and the final price was not provided. Its conservation grade was 75.

Given that the coin will be auctioned soon and considering the previous data, as well as the upward trend in final prices, we could estimate a maximum purchase price around 100-110 euros. It is important to consider the conservation grade of the coin and the market demand at the time of the auction to better adjust this estimation.