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

2. Current listing price and previous prices: The current listing price is 120 euros. In previous auctions, the average hammer price has been 148.73 euros, suggesting that buyers are willing to pay more than the listing price.

3. Price trends: Looking at previous hammer prices for coins with a similar condition (95), it can be noted that they have reached hammer prices that vary, but many have exceeded 150 euros. For example, in recent auctions, hammer prices of 160 euros and 190 euros have been achieved.

4. Supply and demand: The coin has been auctioned 71 times, with a 63% sell-through rate, indicating relatively good demand. However, there are no upcoming auctions scheduled in the near future, which could increase interest in this specific auction.

Based on these factors, an estimated maximum purchase price could be between 160 and 180 euros, considering that the average hammer price has been 148.73 euros and that there are precedents for higher hammer prices for coins in similar conditions.

Therefore, a reasonable maximum purchase price could be 170 euros.