To estimate a maximum purchase price for the coin in question, we can 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. Historical Prices: By looking at previous auction prices for coins with similar conditions, we can see that:
- In 2021, a coin with a condition of 85 sold for 340 euros.
- In 2022, a coin with a condition of 70 sold for 60 euros.
- In 2023, a coin with a condition of 85 sold for 500 euros.

3. Average Auction Price: The average auction price for this coin is 209.1 euros, which gives us an idea of the general market value.

4. Starting Price and Average Starting Price: The current starting price is 25 euros, and the average starting price is 67.97 euros. This suggests that interest in the coin may be higher than the starting price.

5. Recent Trends: The coin has a history of auctions with a high sales percentage (34 out of 35 auctions), indicating consistent demand.

Based on these factors, an estimated maximum purchase price could be in the range of 150 to 250 euros, considering that the condition is good and there is interest in the coin. However, since the average auction price is 209.1 euros, a reasonable maximum purchase price could be approximately 200 euros.