To estimate a maximum purchase price for the coin in question, we can consider several factors based on the provided data:

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. Auction History:
- The average hammer price for this coin in the past is 32.33 euros.
- Previous hammer prices for coins with similar conditions (85 and 90) have varied, but generally, prices have ranged from 12 to 30 euros in recent auctions.

3. Price Trends:
- In recent auctions, hammer prices for coins with a condition of 85 have reached up to 25 euros, and in some cases, even more, depending on demand and the rarity of the coin.

4. Starting Price and Estimated Price:
- The starting price is 10 euros, and the estimated price is 15 euros. This suggests that the seller expects the coin to sell for a reasonable price, but not necessarily a high one.

5. Analysis of Previous Prices:
- Looking at previous hammer prices, the highest recorded price for a coin with a similar condition was 30 euros.

Based on these factors, an estimated maximum purchase price for this coin could be between 25 and 35 euros, considering that the condition is good and there is a price history to support this estimate. However, since the market can be volatile and demand may vary, a price of 30 euros could be a reasonable target for a maximum bid.