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

1. Current Condition: The coin has a condition rating of 70 (VF-). This indicates that it is not in the best condition, but it is also not the worst.

2. Current Starting Price and Previous Prices: The current starting price is 70 euros. In previous auctions, the average hammer price has been 162.08 euros, suggesting there is significant potential for an increase in the selling price.

3. Sales History: The coin has been auctioned 82 times, of which 77 have been successful sales. This indicates good demand and consistent interest in the coin.

4. Previous Hammer Prices: By observing the hammer prices of coins with similar conditions (around 70), we can see that they have reached hammer prices that vary, but some have reached 130-140 euros in similar conditions.

5. Recent Trends: In the most recent auctions, the hammer prices have shown a range that may indicate an increase in interest or value of the coin.

Based on these factors, an estimated maximum purchase price could be in the range of 130 to 160 euros, considering that the coin has a history of hammer prices that align with this range and that condition is an important factor to take into account.

Therefore, a reasonable estimated maximum purchase price could be 150 euros.