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

In the collector's market, coins in similar conditions often reach prices above the starting price, especially if demand is high. Without historical sales data for this reference, it is difficult to make an accurate estimate, but based on the conservation grade and the starting price, a maximum estimated purchase price could be in the range of 1,200 to 1,500 euros, depending on the interest of collectors in the auction.

Therefore, a maximum estimated purchase price could be approximately 1,300 euros.