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 can positively influence its value.

2. Starting Price and Previous Hammer Prices: The current starting price is 800 euros. In the past, the average hammer price for this coin has been 119.06 euros, but there have also been auctions that reached significantly higher prices, such as 420 euros in a previous auction with a condition rating of 95.

3. Price Trends: Looking at previous hammer prices, there is a trend for coins in similar conditions (80) to sell in a range of 60 to 120 euros, but there are also exceptions where they have sold for more, especially if demand is high.

4. Auction Frequency: The coin has been auctioned 96 times, with a high sales percentage (85 out of 96). This suggests that there is consistent interest in this coin, which may increase its market value.

5. Comparison with Previous Starting and Hammer Prices: In previous auctions, coins with similar conditions have had varying starting prices, but the highest recorded hammer price for a condition of 80 was 120 euros.

Based on these factors, an estimated maximum purchase price for this coin could be in the range of 150 to 200 euros, considering that the current starting price is 800 euros and that the condition is good but not exceptional. This also takes into account the possibility that interest in the coin could lead to a higher hammer price if there is competition among bidders.