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: By looking at previous auction prices for coins with a similar condition (95), we can see that the hammer prices have varied but have reached significant figures. For example:
- In previous auctions, coins with a condition of 95 have reached hammer prices of up to 90 euros.
- The average hammer price for coins of similar condition is approximately 65-75 euros.

3. Starting Price and Average Hammer Price: The current starting price is 30 euros, and the average hammer price in the past has been 43.26 euros. This suggests that there is potential for an increase in the hammer price.

4. Recent Trends: In the most recent auctions, hammer prices for coins in condition 95 have shown an increase, which could indicate a rising trend in interest for these coins.

Based on these factors, an estimated maximum purchase price for this coin could be between 80 and 100 euros, considering its good condition and the historical hammer price data from previous auctions. This would allow for effective competition in the auction without exceeding a reasonable limit based on historical data.