Based on the provided data, we can observe that the coin in question had a starting price of 350 euros in the last auction, with an estimated price of 440 euros and a final price of 440 euros. The condition of the coin in this last auction was 95 (FDC).

Considering that the starting price is usually lower than the final price, and that the estimated price falls between these two values, we can estimate that the maximum purchase price for this coin in a future auction could be around 450-460 euros, taking into account the condition and the trend of previous prices.

Therefore, my estimate for the maximum purchase price for this coin in a future auction would be around 450-460 euros.