To estimate a maximum purchase price for the coin in question, we will 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 Prices: By looking at previous auction prices for coins with the same condition (95), we see that there have been auctions that reached up to 120 euros. The average auction price for similar coins is 73.09 euros, but there are cases where it has sold for more.

3. Starting Price: The current starting price is 120 euros, which is a good indicator of the seller's expectations. However, the starting price does not always translate into the final auction price.

4. Sales Trends: The coin has been auctioned 26 times, of which 24 have sold. This indicates good demand and consistent interest in the coin.

5. Comparison with Previous Auction Prices: In previous auctions, the highest final price was 245 euros (although in an unspecified condition), and the most recent price in condition 95 was 120 euros.

Taking all these factors into account, an estimated maximum purchase price could be in the range of 120 to 150 euros. This is based on the good condition of the coin and previous auction prices, as well as market expectations.

Therefore, a reasonable maximum purchase price could be 150 euros.