Given that the coin has a conservation rating of 75 (MBC), indicating good quality, and considering that it is being auctioned for the first time, the starting price is set at 300 euros.

In previous auctions, the average hammer price is 0, which suggests that there is no historical data that could influence the estimation. However, since the conservation is good and there is interest in the auction, we could estimate a hammer price that might be slightly higher than the starting price.

Taking these factors into account, an estimated maximum purchase price could range between 400 and 500 euros, depending on the interest of collectors and the competition in the auction.