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

1. Coin 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. Starting Price: The starting price is 150 euros. This is a good starting point, but not necessarily the final price.

3. Auction History: By observing previous hammer prices for coins with similar conditions (95 and 100), we can see that hammer prices have varied. For example, in previous auctions, coins with a condition of 95 have reached hammer prices of up to 260 euros (as seen in the auction on March 16, 2023).

4. Price Trends: The average hammer price for this particular coin is 100.37 euros, but given the high condition, it is reasonable to expect that the hammer price will be above this average.

5. Comparison with Previous Starting and Hammer Prices: In previous auctions, coins with a condition of 95 have had starting prices ranging from 50 to 200 euros, with hammer prices that have been significantly higher.

Based on these factors, an estimated maximum purchase price for this coin could be between 250 and 300 euros, considering its good condition and the history of hammer prices in previous auctions. This would allow for effective competition in the auction without exceeding a reasonable limit.