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 fairly good shape, but not the best possible condition.

2. Historical Prices: By looking at previous auction prices for coins with a similar condition (85), we can see that the hammer prices have varied, but generally, they have been in a range of 300 to 420 euros.

3. Starting Price and Average Hammer Price: The current starting price is 460 euros, which is higher than the average hammer price of 310.78 euros. This suggests that the seller has high expectations, but it may also indicate that the market is willing to pay more for this particular coin.

4. Recent Trends: In the most recent auctions, hammer prices for coins of similar condition have been in the range of 360 to 440 euros.

Based on these factors, an estimated maximum purchase price could be around 400-450 euros. This is based on the fact that, although the starting price is 460 euros, the price history suggests that a more realistic hammer price for a coin in this condition could be slightly lower.

Therefore, a reasonable maximum purchase price could be 450 euros.