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. Previous Prices: By observing the auction prices of coins with similar conditions (95 and close), we can see that in previous auctions, coins with a condition of 95 have reached hammer prices of up to 280 euros. For example, in the auction on 2020-03-12, a coin with a condition of 95 was sold for 260 euros.

3. Starting Price and Average Hammer Price: The current starting price is 175 euros, and the average hammer price for similar coins is 98.02 euros. However, since the condition of this coin is above average, it is reasonable to expect that the hammer price will be significantly higher.

4. Market Trends: The coin has been auctioned 209 times in the past, with an 81.7% sell-through rate (171 times sold). This suggests that there is consistent interest in this coin, which may influence a higher hammer price.

5. Recent Starting Prices: In recent auctions, starting prices for coins of similar condition have varied, but some have reached hammer prices of up to 950 euros in exceptional conditions.

Based on these factors, an estimated maximum purchase price for this coin could be in the range of 250 to 300 euros. This is based on the condition, previous hammer prices, and market trends. However, it is important to note that the final price may vary depending on the competition in the auction and the interest of collectors at that time.