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 translates to a higher price compared to coins with lower conditions.

2. Previous Auction Prices: By looking at previous hammer prices for coins with a similar condition (95), we can see that they have reached hammer prices of up to 180 euros in the most recent auction (2024-01-18) and 150 euros in another auction (2024-05-30).

3. Average Hammer Price: The average hammer price for this coin is 128.67 euros, which is also a good indicator of the expected value.

4. Starting Price: The current starting price is 110 euros, suggesting that the seller has expectations of a higher hammer price.

5. Sales Trends: The coin has been auctioned 30 times, of which 27 have been sold, indicating good demand and a history of successful sales.

Taking all these factors into account, an estimated maximum purchase price could be in the range of 150 to 180 euros, as this is the range of hammer prices achieved in previous auctions for coins of similar condition.

Therefore, a reasonable maximum purchase price could be 170 euros. This allows for some competition in the auction and aligns with previous hammer prices.