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. Current Starting Price and Previous Prices: The current starting price is 75 euros, and the average hammer price in previous auctions is 131.05 euros. This suggests that, in general, coins of this reference tend to sell for above their starting price.

3. Auction History: In the auction history, it is observed that coins with similar conditions have reached hammer prices that vary, but many are in the range of 110 to 140 euros. For example, in 2020, a coin with a condition of 80 was sold for 110 euros.

4. Recent Trends: In the most recent auctions, hammer prices have been in the range of 120 to 160 euros for similar conditions.

5. Average Hammer Price: The average hammer price of 131.05 euros also indicates that, in general, buyers are willing to pay more than the starting price.

Taking all these factors into account, an estimated maximum purchase price for this coin could be around 130-150 euros. This is based on the hammer price history and the current condition of the coin. However, it is important to remember that the final price may vary depending on the competition in the auction and the interest of collectors.