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

1. Coin Condition: The coin has a condition rating of 70 (MBC-). This indicates that it is in an acceptable state, but not among the best qualities.

2. Previous Auction Prices: By observing the auction prices of coins with a similar condition (70), we can see that they have varied. For example, in previous auctions, coins with a condition of 70 have reached hammer prices of up to 100 euros.

3. Average Hammer Price: The average hammer price for this coin is 102.41 euros, suggesting that, in general, buyers are willing to pay around this amount.

4. Starting Price: The starting price is 60 euros, which is a good starting point, but the hammer price is usually significantly higher.

5. Auction Trends: Since the coin has been auctioned 170 times and sold 145 times, there is good demand for this coin, which may increase its price.

6. Hammer Prices of Similar Coins: In the history, we have seen that coins with a condition of 70 have reached hammer prices of up to 100 euros, and some even higher depending on the demand at the time of the auction.

Based on these factors, an estimated maximum purchase price for this coin could be between 90 and 110 euros. This is based on the average hammer price and the price history of coins with a similar condition.

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