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

1. Coin Condition: The coin 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 observing previous auction prices for coins with similar conditions (95 and 100), we can see that the hammer prices have varied. For example:
- In 2019, a coin with a condition of 95 was auctioned for 30 euros.
- In 2020, a coin with a condition of 100 was auctioned for 65 euros.
- In 2023, a coin with a condition of 100 was auctioned for 55 euros.

3. Starting Price and Average Hammer Price: The current starting price is 30 euros, and the average hammer price for similar coins is 20.06 euros. However, given that the condition of this coin is high, it is reasonable to expect that the hammer price will be above average.

4. Recent Trends: In the most recent auctions, hammer prices for high-condition coins have shown an increase, suggesting that interest in these coins is growing.

Taking all these factors into account, an estimated maximum purchase price for this coin could be between 50 and 70 euros, considering its high condition and market interest. This aligns with the hammer prices of similar coins in the past.