To estimate a maximum purchase price for the coin in question, we can consider several factors based on the provided data:

1. Coin 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. Auction History:
- The average hammer price for this coin in the past is 41.47 euros.
- In previous auctions, hammer prices have varied, but there are examples of sales reaching up to 180 euros (in the case of a condition rating of 100).
- Most hammer prices for coins with similar condition (95) have been in the range of 9 to 100 euros.

3. Starting Price and Estimated Prices:
- The current starting price is 9 euros, which is relatively low compared to the average hammer price.
- The estimated price for this auction is 25 euros, which also suggests potential for an increase in the hammer price.

4. Sales Trends: The coin has sold in 16 out of the 19 previous auctions, indicating good demand.

Based on these factors, an estimated maximum purchase price could be in the range of 50 to 70 euros, considering that the condition is high and the hammer price history suggests it could reach higher values in auctions. However, since the starting price is low, it could be a good opportunity to acquire it at a reasonable price.