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 condition ratings.

2. Current Price and Previous Prices: The current starting price is 900 euros. In the past, coins of the same reference have been auctioned with hammer prices that varied significantly, but there are examples of hammer prices exceeding 1000 euros, especially for coins in similar conditions (95).

3. Price Trends: Looking at previous hammer prices, there are several coins with similar conditions that have sold for over 1000 euros. For example, in past auctions, coins with a condition of 90 and 95 have reached hammer prices of up to 1700 euros.

4. Supply and Demand: Given that there are 2 auctions scheduled in the coming days and the coin has been auctioned 160 times in the past, demand may be high, which could push the price upwards.

Based on these factors, an estimated maximum purchase price could be between 1200 and 1500 euros, considering that the starting price is 900 euros and there are precedents of higher hammer prices for coins in similar conditions. However, it is important to keep in mind that the final price will depend on the competition in the auction and the willingness of buyers to pay.