To estimate a maximum purchase price for the coin in question, we will consider 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. Auction History:
- The average hammer price for this coin has been 15.98 euros.
- In previous auctions, we have seen hammer prices that varied significantly, ranging from 3 euros to 130 euros, depending on the condition and demand at that time.
- The highest recorded auction for a coin in condition 100 was 130 euros, while for a condition of 95, the highest hammer price was 50 euros.

3. Starting Price and Average Starting Price:
- The current starting price is 9 euros, and the average starting price has been 10.09 euros. This suggests that the starting price is reasonable and could attract bidders.

4. Recent Trends: In the most recent auctions, hammer prices for coins of similar condition have been in the range of 15 to 25 euros.

Based on these factors, an estimated maximum purchase price for this coin could be between 25 and 35 euros, considering that the condition is high and there is a history of hammer prices that supports this estimate. However, since the market can be volatile, it is advisable to keep an eye on the auction and adjust the bid according to the competition.