To estimate a maximum purchase price for the coin in question, we can analyze the provided data, especially the current condition of the coin (95, EBC+) and previous auction prices.

1. Condition: The coin has a condition of 95, indicating that it is in very good shape. This generally translates to a higher price compared to coins in lower condition.

2. Previous auction prices:
- In previous auctions, the hammer prices have varied, but there are some key points:
- In 2021, a coin with a condition of 90 sold for 650 euros.
- In 2023, a coin with a condition of 85 sold for 320 euros.
- In 2024, a coin with a condition of 85 sold for 500 euros.

3. Price trends:
- The average hammer price for coins of this reference is 358.75 euros, suggesting that the market is willing to pay around this amount on average.
- The current starting price is 400 euros, which is slightly higher than the average hammer price, but may be justified by the high condition of the coin.

4. Maximum price estimation:
- Given that the condition of the coin is high (95), and considering the previous auction prices, a reasonable maximum purchase price could be in the range of 600 to 700 euros, especially considering that in the past, hammer prices of up to 650 euros have been reached for coins in slightly lower condition.

Therefore, an estimated maximum purchase price for this coin could be 650 euros.