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

1. Condition: The coin has a condition of 85 (ebc-), which indicates that it is in quite good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Auction History:
- The average hammer price for this coin is 140 euros.
- In previous auctions, we have seen hammer prices that varied, but some relevant examples are:
- In 2018, with a condition of 85, it sold for 65 euros.
- In 2022, with a condition of 90, it sold for 190 euros.
- In 2021, with a condition of 95, it sold for 260 euros.

3. Starting Price and Estimated Prices:
- The current starting price is 60 euros, which is slightly lower than the average starting price of 64.38 euros.
- The estimated price of 80 euros in a previous auction with a similar condition is also relevant.

4. Price Trends: Observing the trends, it seems that hammer prices have been increasing, especially for coins in better condition.

Based on these factors, an estimated maximum purchase price could be in the range of 150 to 200 euros, considering that a condition of 85 is quite good and that the price history shows that coins in similar conditions have reached higher prices in the past.

Therefore, a reasonable maximum purchase price could be 180 euros.