To estimate a maximum purchase price for the coin in question, let's consider the following factors:

1. Starting Price: 1500 euros.
2. Condition: The coin has a condition rating of 95 (S/C-), indicating that it is in very good shape, although not the best possible condition (which would be 110).
3. Auction History: The coin has been auctioned once before, with an estimated price of 2000 euros and a hammer price of 4800 euros. This suggests that there is significant interest in this coin, and that the hammer price can be considerably higher than the starting price.
4. Average Hammer Price: The average hammer price for this coin is 4800 euros, indicating that, in general, buyers are willing to pay much more than the starting price.

Given that the coin is in good condition and has shown high interest in previous auctions, a reasonable maximum purchase price could be slightly lower than the average hammer price, but still significant.

Estimated Maximum Purchase Price: It could be reasonable to consider a maximum purchase price in the range of 4000 to 4500 euros, given the auction history and the condition of the coin. This allows for some competition in the auction, while still remaining below the previous average hammer price.