To estimate a maximum purchase price for the coin in question, we can analyze the provided data, especially the previous auction prices and the current condition of the coin.

1. Current Condition: The coin has a condition rating of 85 (ebc-), indicating that it is in fairly good shape, but not the best possible condition.

2. Previous Auction Prices: By looking at the auction prices of coins with similar conditions (85 and 90), we can see that the average auction price for coins in similar conditions has been around 1,900 to 2,200 euros in recent auctions.

3. Starting Price and Average Auction Price: The starting price is 1,500 euros, and the average auction price in the past has been 1,838.46 euros. This suggests that the auction price could be in a similar range or slightly higher.

4. Auction Trends: The coin has been auctioned 46 times, of which 38 have sold. This indicates good demand and consistent interest in the coin.

5. Estimation: Given that the condition is 85 and considering the previous auction prices, an estimated maximum purchase price could be between 2,000 and 2,500 euros. This is based on the fact that auction prices for coins in similar conditions have reached up to 2,250 euros in recent auctions.

Therefore, an estimated maximum purchase price for this coin could be 2,200 euros.