To estimate a maximum purchase price for the coin in question, we can analyze several factors:

1. Current Condition: The coin has a condition rating of 80 (MS+). This is an important factor, as coins in better condition tend to reach higher prices.

2. Starting Price: The starting price is 460 euros. This is the starting point for the auction.

3. Sales History: By observing the hammer prices of coins with similar conditions in the past, we can see that the hammer prices have varied. For example, in previous auctions, coins with conditions ranging from 75 to 90 have had hammer prices ranging from 260 to 400 euros, depending on demand and other factors.

4. Recent Trends: In the most recent auctions, hammer prices for coins with conditions of 85 to 90 have been around 360 to 450 euros. This suggests that there is growing interest in coins of similar quality.

5. Average Hammer Price: The average hammer price for this coin is 299.08 euros, indicating that, in general, buyers are willing to pay around this amount.

Given all this, an estimated maximum purchase price for this coin could be in the range of 400 to 500 euros, considering that the condition is good and the starting price is 460 euros. However, since the starting price is already relatively high, it is likely that the hammer price will not exceed 500 euros unless there is strong competition in the auction.

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