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 95 (S/C-), indicating that it is in very good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Previous Auction Prices: By looking at the hammer prices of coins with a similar condition (95), we can see that in previous auctions, the hammer prices have varied. For example:
- In the auction on 2023-03-16, a coin with a condition of 95 was sold for 800 euros.
- In other auctions, the hammer prices for coins with a condition of 95 have been 500 euros and 1700 euros.

3. Starting Price and Average Hammer Price: The current starting price is 600 euros, and the average hammer price for this coin in the past has been 172.54 euros. However, given the high condition, it is likely that the actual hammer price will be above this average.

4. Auction Trends: The coin has been auctioned 48 times, of which 42 have been sold. This indicates a consistent interest in the coin, which may increase its value.

5. Comparison with Starting and Hammer Prices: The average starting price of 98.89 euros and the average hammer price of 172.54 euros are significantly lower than the current starting price of 600 euros, suggesting that the market has changed and prices may be rising.

Based on these factors, an estimated maximum purchase price for the coin could be in the range of 800 to 1000 euros, considering that there are precedents for sales in that range for coins with similar conditions. However, given the interest and condition, a price of up to 1200 euros could be reasonable if there is competition in the auction.