To estimate a maximum purchase price for the coin in question, we can consider several factors:

1. Current Condition: The coin has a condition rating of 95 (EBC+), indicating that it is in very good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Historical Prices: By looking at previous auction prices for coins with similar conditions, we can see that prices have varied. For example, in past auctions, coins with condition ratings of 90 and 95 have reached hammer prices of up to 500 euros.

3. Starting Price and Average Hammer Price: The current starting price is 500 euros, and the average hammer price for this coin is 194.8 euros. However, given the high condition, it is reasonable to expect that the hammer price will be above the average.

4. Recent Trends: In the most recent auctions, we have seen hammer prices reaching up to 650 euros for coins of similar condition.

Based on these factors, an estimated maximum purchase price for this coin could be between 500 and 700 euros, considering that the condition is high and there is interest in quality coins. A more conservative price could be around 600 euros, while a more optimistic price could reach 700 euros.

Therefore, a reasonable estimated maximum purchase price would be 650 euros.