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. Previous Auction Prices: By looking at previous hammer prices for coins with similar conditions, we can see that:
- In recent auctions, coins with a condition of 85 have reached hammer prices of up to 1300 euros.
- In 2022, a coin with a condition of 95 sold for 2000 euros, indicating that the market is willing to pay high prices for coins in good condition.

3. Starting Price and Average Hammer Price: The current starting price is 1200 euros, and the average hammer price in the past has been 1167.9 euros. This suggests that the starting price is reasonable and that there is potential for the hammer price to be higher.

4. Market Trends: Given that the coin has been auctioned 24 times and has a sell-through rate of 91.67% (22 out of 24), this indicates consistent demand. Additionally, the fact that there are no scheduled auctions in the coming days may increase interest in this specific auction.

Based on these factors, an estimated maximum purchase price could be around 1400-1500 euros, considering that the condition is good and there are precedents for hammer prices in that range for similar coins.