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

1. Coin Condition: The coin has a condition rating of 85 (ebc-), which indicates that it is in quite good shape. This is important because coins in better condition tend to fetch higher prices.

2. Previous Auction Prices: By looking at the hammer prices of coins with a similar condition (85) in the past, we can see that they have reached hammer prices that vary, but generally fall within a range of 160 to 270 euros, depending on demand and other factors.

3. Average Hammer Price: The average hammer price for this particular coin is 147.83 euros, which gives us an idea of what buyers are willing to pay on average.

4. Starting Price: The starting price of 175 euros is slightly higher than the average hammer price, which may indicate that the seller expects significant interest in the coin.

5. Recent Trends: In the most recent auctions, hammer prices have shown a trend of being higher, with some reaching up to 400 euros in exceptional conditions.

Based on these factors, an estimated maximum purchase price for this coin could be in the range of 200 to 250 euros, considering that the condition is good and there is potential interest in the coin. However, it is important to keep in mind that the final price will depend on the competition in the auction and the specific demand at that moment.