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 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 Prices: By looking at previous auction prices for coins with a similar condition (85), we can see that in the past, coins with this condition have reached auction prices of up to 320 euros (at the auction on 2022-05-07).

3. Average Auction Price: The average auction price for this coin is 145.06 euros, which provides a useful benchmark.

4. Current Starting Price: The starting price is 150 euros, indicating that the seller has high expectations for this auction.

5. Auction Trends: The coin has been auctioned 39 times, with a sell-through rate of 94.87% (37 out of 39). This suggests that there is consistent interest in this coin.

Based on these factors, an estimated maximum purchase price could be in the range of 200 to 300 euros, considering that the highest auction price in the past was 320 euros and that the current condition is favorable.

Therefore, a reasonable estimated maximum purchase price could be 250 euros.