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 generally translates to a higher price compared to coins with lower conditions.

2. Current Listing Price and Previous Prices: The current listing price is 80 euros. In previous auctions, we have seen hammer prices that vary, but there are several examples of coins with similar conditions that have sold for over 100 euros. For instance, in past auctions, coins with a condition of 80 have reached hammer prices of 110 to 150 euros.

3. Average Hammer Price: The average hammer price for this coin is 113.46 euros, suggesting that, on average, buyers are willing to pay around this amount.

4. Auction Trends: Given that the coin has been auctioned 118 times and sold 104 times, there is good demand for this coin. This may indicate that prices tend to remain stable or even increase over time.

5. Analysis of Previous Prices: Looking at previous hammer prices, there are examples where coins with a condition of 80 have reached hammer prices of up to 150 euros.

Based on these factors, an estimated maximum purchase price for this coin could be between 120 and 150 euros. This is because, although the listing price is 80 euros, the condition and previous hammer prices suggest that buyers might be willing to pay more, especially if there is interest in the auction.

Therefore, a reasonable estimated maximum purchase price could be 130 euros.