To estimate a maximum purchase price for the coin in question, we can analyze the provided data, especially the coin's condition and previous auction prices.

1. Coin Condition: The coin has a condition rating of 80 (VF+), indicating that it is in quite good shape. This suggests that its price should be above that of coins with lower conditions.

2. Previous Auction Prices: By looking at the auction prices of coins with a similar condition (80 or close), we can see that:
- In previous auctions, coins with a condition of 80 have reached hammer prices of up to 60 euros.
- Coins with a condition of 90 have reached hammer prices of up to 300 euros, indicating a wide range depending on demand and rarity.

3. Average Hammer Price: The average hammer price for this coin is 100.98 euros, which is also a good indicator of what could be expected.

4. Starting Price: The starting price is 30 euros, which is relatively low compared to the average hammer price.

5. Auction Trends: Given that it has been auctioned 131 times and sold 116 times, there is good demand for this coin, which may increase its price in the next auction.

Based on these factors, an estimated maximum purchase price for this coin could be between 100 and 150 euros, considering that the condition is good and the average hammer price is approximately 100.98 euros. However, given the interest and demand, a price of up to 150 euros could be reasonable if there is active competition in the auction.