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. Current Listing Price and Previous Prices: The current listing price is 360 euros. In previous auctions, the average hammer price has been 293.89 euros, suggesting that the current listing price is relatively high compared to the historical average.

3. Price Trends: By observing the hammer prices of coins with similar conditions (around 85), we can see that they have reached hammer prices that vary, but some have exceeded 400 euros in similar conditions.

4. Analysis of Previous Prices: In past auctions, coins with a condition rating of 85 have had hammer prices ranging between 300 and 400 euros, with some exceptional cases reaching up to 550 euros.

5. Market Expectations: Given that the coin will be auctioned in the near future and considering the potential demand, it is reasonable to expect that the hammer price could be higher than the historical average.

Based on these factors, an estimated maximum purchase price for this coin could be between 400 and 450 euros, considering that the condition is favorable and there is a trend for hammer prices to be higher in recent auctions.