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

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

2. Previous auction prices:
- The average hammer price for this coin has been approximately 2993.48 euros.
- In previous auctions, the hammer price has varied, but it has reached up to 6500 euros on some occasions, especially in similar conditions.

3. Starting price: The current starting price is 3000 euros, which is a reasonable starting point.

4. Sales trends: The coin has sold in 24 out of the last 26 auctions, indicating good demand.

5. Estimated prices: Estimated prices in previous auctions have been as high as 6000 euros, suggesting there is potential for a high hammer price.

Taking all these factors into account, an estimated maximum purchase price could be around 5000 euros. This is based on the auction price history and the good condition of the coin. However, it is important to consider that the final price may vary depending on the competition in the auction and the interest from other buyers.