To estimate a maximum purchase price for the coin in question, we will consider several factors:

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 value compared to coins with lower conditions.

2. Current Price and Previous Prices: The current starting price is 150 euros. In previous auctions, we have seen hammer prices that vary significantly, but there are examples of coins with similar conditions that have sold for higher prices. For instance, in a previous auction, a coin with a condition of 95 sold for 150 euros, and on another occasion, the hammer price was 220 euros.

3. Price Trends: The average hammer price for similar coins is 72.36 euros, but this may be influenced by coins with lower conditions. Given that the condition of this coin is high, it is reasonable to expect that the hammer price will be significantly higher.

4. Demand and Supply: The coin has been auctioned 197 times in the past, with 163 sales, indicating considerable interest. Additionally, it will be auctioned in the coming days, which may increase competition and, consequently, the price.

Taking all these factors into account, an estimated maximum purchase price could be between 200 and 250 euros, considering that the condition is high and there are precedents for successful sales at higher prices. However, the starting price of 150 euros also suggests that there may be opportunities to acquire it at a lower price if competition is not intense.