To estimate a maximum purchase price for the coin in question, we can consider several factors based on the provided data:

1. Current Condition: The coin has a condition of 80 (MS+), indicating that it is in quite good shape. This suggests that its value could be in the mid-high range of previous auctions.

2. Previous Auction Prices: By observing the hammer prices of coins with similar conditions (80 and 85), we can see that the hammer prices have varied considerably. For example:
- In 2020, a coin with a condition of 80 was auctioned for 120 euros.
- In 2019, another coin with a condition of 80 was auctioned for 130 euros.
- In 2022, a coin with a condition of 80 was auctioned for 320 euros.

3. Average Hammer Price: The average hammer price for this coin is 225.32 euros, which is also a good indicator of the expected value.

4. Starting Price: The starting price is 80 euros, which is relatively low compared to previous hammer prices.

5. Auction Trends: Given that the coin has been auctioned 62 times and has sold 58 times, there is high demand and consistent interest in this coin.

Based on these factors, an estimated maximum purchase price could be in the range of 250 to 350 euros, considering that the condition is good and there are records of higher hammer prices in the past. However, since the starting price is 80 euros, it is likely that buyers will be willing to bid more, especially if there is interest in the coin.

Therefore, a reasonable maximum purchase price could be 300 euros.