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

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

2. Auction History:
- The average hammer price for this coin in the past has been 157.17 euros.
- Hammer prices have varied significantly, ranging from 40 euros to 900 euros, depending on the condition and demand at the time of the auction.
- In recent auctions, hammer prices of 220 euros (condition 90) and 180 euros (condition 80) have been reached.

3. Starting Price: The current starting price is 175 euros, indicating that the seller has expectations of a relatively high hammer price.

4. Price Trends: In the most recent auctions, hammer prices have shown a trend of being higher, especially for coins in good condition.

Based on these factors, an estimated maximum purchase price for this coin could be in the range of 250 to 300 euros. This range takes into account the good condition of the coin and the hammer prices achieved in previous auctions for coins of similar condition.