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

1. Coin Condition: The coin to be auctioned has a condition of 70 (MBC-). This is an important factor, as coins in better condition tend to reach higher prices.

2. Previous Prices: By observing the hammer prices of coins with a similar condition (70), we can see that in the past, coins with this condition have reached hammer prices of up to 100 euros (as seen in the auction on 2022-04-28).

3. Average Hammer Price: The average hammer price for this particular coin is 94.94 euros, which also provides us with a reference.

4. Auction Trends: The coin has been auctioned 35 times, of which it has sold 32 times. This indicates good demand and consistent interest in the coin.

5. Starting Price: The starting price is 40 euros, which is relatively low compared to previous hammer prices.

Based on these factors, an estimated maximum purchase price could be in the range of 90 to 120 euros, considering that the condition is good and there are precedents of higher hammer prices in the past. However, since the starting price is 40 euros, it is likely that the hammer price will not significantly exceed the average hammer price of 94.94 euros.

Therefore, a reasonable estimated maximum purchase price could be 100 euros.