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. Auction History:
- The average hammer price in previous auctions is 16.13 euros.
- Hammer prices of up to 130 euros have been recorded for coins with similar condition (100), and hammer prices of 50 euros for coins with a condition of 95.
- The trend of hammer prices for coins with a condition of 95 has been in a range of 12 to 50 euros in previous auctions.

3. Starting Price: The starting price is 12 euros, which may influence the final price, as buyers often consider the starting price as an indicator of the coin's value.

4. Supply and Demand: The coin has been auctioned 87 times, with 59 sales, indicating moderate interest in the coin. The next auction may attract interested buyers, especially if the condition is high.

Taking these factors into account, an estimated maximum purchase price could be in the range of 30 to 50 euros, considering that the condition is high and there is a history of hammer prices that supports this estimate. However, since the starting price is 12 euros, it is likely that the final price will not significantly exceed this range unless there is active competition among bidders.

Therefore, a reasonable maximum purchase price could be 40 euros.