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

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

2. Previous Auction Prices: By observing the hammer prices of coins with similar conditions (95 and 90), we can see that the hammer prices have varied. For example:
- In previous auctions, coins with a condition of 95 have sold for prices ranging from 240 to 950 euros.
- The last auction of a coin with a condition of 95 had a hammer price of 950 euros.

3. Starting Price and Average Hammer Price: The starting price of the coin is 150 euros, and the average hammer price of similar coins is 98.74 euros. However, since the condition of this coin is higher, it is reasonable to expect that the hammer price will be higher.

4. Market Trends: Given that the coin has been auctioned 218 times in the past and has a good sales history, this suggests that there is consistent interest in this coin.

Based on these factors, an estimated maximum purchase price for this coin could be between 300 and 400 euros, considering that the condition is high and there are precedents for hammer prices in that range. However, given the history of higher hammer prices, a price of up to 500 euros could be considered if there is active competition in the auction.