To estimate a maximum purchase price for the coin in question, we will consider several factors:

1. Coin Condition: The coin has a condition of 80 (MS+), indicating that it is in quite good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Previous Auction Prices: By observing the hammer prices of coins with similar conditions (around 80), we can see that they have reached hammer prices that vary considerably. For example:
- In 2019, a coin with a condition of 80 was auctioned for 170 euros.
- In 2020, another coin with a condition of 80 was auctioned for 80 euros.
- In 2023, a coin with a condition of 80 was auctioned for 120 euros.

3. Average Hammer Price: The average hammer price for this coin is 111.05 euros, providing a good reference point.

4. Current Starting Price and Recent Auction Prices: The current starting price is 60 euros, and the average starting price is 76.24 euros. This suggests that the market is willing to pay more than the starting price, especially considering the condition.

5. Market Trends: Given that the coin has been auctioned 186 times and has had a high sales percentage (167 out of 186), this indicates consistent demand.

Based on these factors, an estimated maximum purchase price for this coin could be between 120 and 150 euros, considering that the condition is good and there are precedents of higher hammer prices in the past. However, given the current market context and price trends, a reasonable maximum purchase price could be 130 euros.