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

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 Auction Prices: By looking at previous auction prices for coins with a similar condition (95), we find that they have reached auction prices of up to 320 euros in recent sales. For example:
- In 2019, a coin with a condition of 95 was sold for 320 euros.
- In 2020, another coin with the same condition was sold for 180 euros.

3. Average Auction Price: The average auction price for this coin is 128.03 euros, indicating that, in general, coins of this reference tend to sell for above this price.

4. Starting Price: The current starting price is 125 euros, suggesting that the seller has expectations for the coin to sell for a reasonable price.

5. Auction Trends: Given that it has been auctioned 79 times and sold 68 times, this indicates good demand for this coin.

Based on these factors, an estimated maximum purchase price could be in the range of 250 to 320 euros, considering that the condition is high and there are precedents for sales in that range. However, since the starting price is 125 euros, it is likely that buyers will be willing to bid more, especially if there is interest in the coin.

Therefore, an estimated maximum purchase price could be approximately 300 euros.