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

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

2. Auction History: By looking at the hammer prices of similar coins in the past, we can see that coins with similar conditions (85-95) have reached hammer prices that vary considerably. For example:
- In 2021, a coin with a condition of 95 was auctioned for 750 euros.
- In 2022, another coin with a condition of 85 sold for 200 euros.

3. Starting Price and Previous Prices: The current starting price is 400 euros, and the average hammer price in the past has been 146.5 euros. However, given that the condition of this coin is high, it is reasonable to expect that the hammer price will be significantly higher than the average.

4. Price Trends: Since the coin has been auctioned 37 times in the past and has had a good sales percentage (33 out of 37), this suggests that there is consistent interest in this coin.

Based on these factors, an estimated maximum purchase price could be in the range of 600 to 800 euros, considering that the condition is high and there are precedents for successful sales at elevated prices. However, the final price will depend on the competition in the auction and the interest of other bidders.