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 generally translates to a higher price compared to coins with lower conditions.

2. Auction History:
- The average hammer price in previous auctions is 45.36 euros.
- In recent auctions, hammer prices have reached up to 160 euros for coins with similar condition (90) and 110 euros in other auctions.

3. Starting Price: The starting price is 30 euros, which may influence the final price, but does not necessarily limit the maximum price that can be reached.

4. Price Trends: Looking at previous hammer prices, there is a considerable range. The coin has reached hammer prices of 35 euros in the past, but has also reached 160 euros in a recent auction.

5. Supply and Demand: Since there are no auctions scheduled in the coming days, this could increase the demand for the coin in this specific auction.

Based on these factors, an estimated maximum purchase price could be in the range of 80 to 120 euros, considering that the condition is good and there is a history of hammer prices that supports this estimate.

Therefore, a reasonable maximum purchase price could be 100 euros.