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 80 (MBC+), indicating that it is in quite good shape. This suggests that its value should be above that of coins with lower conditions.

2. Previous Auction Prices: By looking at the hammer prices of coins with a similar condition (80), we can see that they have reached hammer prices that vary, but generally, the hammer prices for coins in similar conditions have been in the range of 25 to 170 euros, depending on demand and other factors.

3. Average Hammer Price: The average hammer price for this particular coin is 128.83 euros, which provides a good reference point.

4. Starting Price and Recent Auction Prices: The current starting price is 40 euros, which is relatively low compared to the average hammer price. This could indicate a good buying opportunity.

5. Auction Trends: Since it has been auctioned 266 times and sold 224 times, the coin has a solid sales history, suggesting that there is interest in it.

Based on these factors, an estimated maximum purchase price could be in the range of 150 to 200 euros, considering that the average hammer price is 128.83 euros and that the coin's condition is good. This also takes into account the possibility that demand in the current auction may be high, which could drive up the final price.