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

1. Condition: The coin has a condition of 95 (S/C-), which indicates 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 observing the hammer prices of coins with similar conditions (95 and 100), we can see that the hammer prices have varied considerably. For example:
- In 2014, a coin with a condition of 95 was auctioned for 122 euros.
- In 2018, another coin with a condition of 95 was auctioned for 70 euros.
- In 2020, coins with a condition of 100 were auctioned for 176 and 300 euros.

3. Starting price and average hammer price: The current starting price is 125 euros, and the average hammer price in the past has been 69 euros. However, given that the condition of this coin is high, it is reasonable to expect that the hammer price will be above average.

4. Market trends: Since the coin has been auctioned 49 times and has had a high sales percentage (42 out of 49), this suggests that there is consistent interest in this coin.

Based on these factors, an estimated maximum purchase price could be between 150 and 250 euros, considering that the condition is high and that significant hammer prices have been reached in the past for coins in similar conditions.

Therefore, a reasonable maximum purchase price could be 200 euros.