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 to be auctioned has a condition of 80 (MBC+). This is an important factor, as coins in better condition tend to reach higher prices.

2. Previous Prices: By observing the hammer prices of coins with similar conditions (around 80), we can see that they have reached hammer prices that vary considerably. For example:
- In 2019, a coin with a condition of 80 was auctioned for 25 euros.
- In 2022, a coin with a condition of 85 was auctioned for 190 euros.
- In 2021, a coin with a condition of 90 was auctioned for 650 euros.

3. Average Hammer Price: The average hammer price for this coin is 98.22 euros, which gives us a good reference of what buyers are willing to pay.

4. Starting Price: The starting price is 40 euros, indicating that the seller expects a reasonable minimum price.

5. Auction Trends: The coin has been auctioned 81 times, of which 72 have resulted in sales. This suggests that there is a consistent interest in this coin.

Given all this, an estimated maximum purchase price could be in the range of 150 to 250 euros, considering that the condition is good and there is a history of hammer prices that supports this estimate. However, since the average hammer price is 98.22 euros, it is wise not to exceed 250 euros in the bid, unless there is a strong conviction that demand will be high in this specific auction.

Therefore, a reasonable estimated maximum purchase price could be 200 euros.