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

1. Coin Condition: The coin has a condition rating of 95 (S/C-), indicating that it is in very good condition. This generally translates to a higher price compared to coins with lower conditions.

2. Starting Price: The starting price is 900 euros. This is the baseline for the auction.

3. Price History: By looking at previous hammer prices for coins with a similar condition (95), we can see that they have reached hammer prices that vary, but some have gone for 1200 euros or more in recent auctions.

4. Auction Trends: The coin has been auctioned 247 times, with a sales percentage of 84.6% (209 out of 247). This suggests that there is considerable interest in this coin, which may drive up its price in the current auction.

5. Previous Hammer Prices: In past auctions, coins with a condition of 95 have had hammer prices ranging from 650 to 1400 euros, depending on demand and other market factors.

Based on these points, an estimated maximum purchase price for this coin could be between 1200 and 1500 euros, considering that interest in the coin is high and its condition is excellent. However, the final price will depend on the competition in the auction and the willingness of other bidders to pay.