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

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

2. Auction History:
- It has been auctioned 5 times in the past, of which it has sold 4 times.
- The average hammer price in previous auctions is 97.5 euros.
- Previous hammer prices for coins with similar conditions (70 and 80) are relevant. For example, in a 2022 auction, a coin with a condition of 70 sold for 50 euros, while one with a condition of 80 sold for 110 euros.

3. Starting Price and Average Starting Price: The current starting price is 60 euros, which is below the average starting price of 74 euros. This could indicate a buying opportunity.

4. Price Estimation: Given that the condition is 70 and considering the hammer price history, a reasonable hammer price could be between 50 and 110 euros, depending on the demand at the auction.

Taking all these factors into account, an estimated maximum purchase price could be around 90 euros. This is based on the average hammer price and the price history of coins with similar conditions.