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

1. Coin Condition: The coin to be auctioned has a condition of 80 (MBC+), which indicates that it is in quite good shape. This is important because coins in better condition tend to fetch higher prices.

2. Price History: By looking at previous auction prices for coins with a similar condition (80), we can see that they have reached hammer prices of up to 150 euros in recent auctions. For example, at the auction on 2019-07-04, a coin with a condition of 90 sold for 150 euros.

3. Average Hammer Price: The average hammer price for this coin is 88.42 euros, which gives us a good reference for what buyers are willing to pay.

4. Starting Price: The starting price is 60 euros, which is reasonable and may attract bidders.

5. Recent Trends: In recent auctions, we have seen that coins with similar conditions have reached hammer prices exceeding 100 euros, especially if there is interest in the coin.

Taking all these factors into account, an estimated maximum purchase price for this coin could be between 120 and 150 euros, considering that the condition is good and there is a price history that supports this estimate. Therefore, a reasonable maximum purchase price could be 150 euros.