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 relatively good shape. This suggests that its value should be above the average for coins in worse conditions.

2. Previous Prices: By looking at the auction prices of coins with similar conditions (around 80), we can see that the hammer prices have varied. For example:
- In previous auctions, coins with a condition of 80 have reached hammer prices of up to 160 euros.
- The average hammer price for coins of similar condition seems to be in the range of 70 to 120 euros.

3. Average Hammer Price: The average hammer price for this coin is 101.08 euros, which is also a good indicator of the expected value.

4. Auction Trends: The coin has been auctioned 165 times, with an 86.67% sell-through rate, indicating good demand. Additionally, there are 2 auctions scheduled in the coming days, which may increase interest.

5. Starting Price: The starting price is 25 euros, which is quite low compared to the average hammer price.

Based on these factors, an estimated maximum purchase price for this coin could be in the range of 120 to 160 euros, considering that the condition is good and there is a history of hammer prices that supports this estimate.

Therefore, a reasonable estimated maximum purchase price could be 150 euros.