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

1. Condition: The coin has a condition rating of 95 (EF+), indicating that it is in very good shape. This generally translates to a higher price compared to coins in lower conditions.

2. Starting price and previous prices: The current starting price is 600 euros, and the average hammer price in previous auctions is approximately 630.98 euros. This suggests that the hammer price tends to be above the starting price.

3. Price trends: By observing the hammer prices of coins with similar conditions in the past, we can see that prices have fluctuated, but generally, coins in similar conditions have reached hammer prices that exceed the current starting price.

4. Previous estimated prices: In previous auctions, estimated prices for coins with similar conditions have ranged from 600 to 900 euros, with some hammer prices reaching up to 1400 euros in exceptional conditions.

Given all this, an estimated maximum purchase price for this coin could be in the range of 800 to 1000 euros, considering that the condition is high and that interest in quality coins tends to be strong at auctions. However, it is important to keep in mind that the final price will depend on the competition in the auction and the interest of other buyers.