Given that the coin has a grade of 95 (S/C-), which is a very high grade, and considering that this is the first time it is being auctioned, the starting price is set at 900 euros.

In general, coins in similar conditions tend to reach hammer prices that can be significantly higher than the starting price, especially if there is interest in the auction. Without historical sales data for this specific coin, it is difficult to make an accurate estimate, but we can consider that, in previous auctions of coins with similar grades, hammer prices can range from 1.5 to 2 times the starting price.

Therefore, an estimated maximum purchase price could be in the range of 1350 to 1800 euros, depending on the interest of the bidders and the demand at the time of the auction.

In summary, an estimated maximum purchase price could be around 1500 euros.