To estimate a maximum purchase price for the coin in question, we can analyze the provided data, including auction history and previous hammer prices.

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. Price History:
- The average hammer price for coins with a similar condition (85) in the past has been approximately 2,762.46 euros.
- In previous auctions, hammer prices for coins with a condition of 85 have varied, but there have been hammer prices of up to 3,300 euros (in the case of a coin with a condition of 95).

3. Starting Price: The starting price of the current auction is 2,000 euros, which is a reasonable starting point.

4. Sales Trends: The coin has been sold in 26 out of the last 30 auctions, indicating good demand.

5. Maximum Price Estimate: Given that the average hammer price is 2,762.46 euros and considering that the condition is 85, a reasonable maximum purchase price could be in the range of 3,000 to 3,500 euros, depending on the competition in the auction and the interest of other bidders.

Conclusion: An estimated maximum purchase price for this coin could be approximately 3,200 euros. This is based on the price history, current condition, and sales trend.