Based on the information provided, we know that the coin will be auctioned for the first time and is in a conservation grade of 75 (MBC). Since there are no previous auction data for this coin, we can consider the starting price as an initial reference.

Given that the conservation grade is 75 (MBC), we can assume that the coin is not in perfect condition, but also not in poor condition. Considering that the starting price is 25 euros, we could estimate a maximum purchase price around 30-35 euros, taking into account that the conservation is not the best.

It is important to note that the final auction price will depend on the demand from buyers at that specific moment, so this estimation is just an approximate reference.