To estimate a maximum purchase price for the coin in question, we can analyze the provided data, including auction history and condition.

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

2. Price History:
- The average hammer price for similar coins in the past is 445.26 euros.
- The condition of the coins auctioned in the past varies, but there are examples of coins with similar condition (70) that have sold for prices ranging from 180 to 270 euros.

3. Starting Price: The current starting price is 150 euros, indicating that the seller expects the coin to sell for a higher price.

4. Price Trends: Observing the hammer prices of coins with a condition of 70, the range seems to be between 200 and 300 euros in recent auctions.

5. Estimation: Given that the average hammer price is significantly higher than the starting price, and considering the condition of the coin, an estimated maximum purchase price could be around 300-350 euros. This is based on the price history of coins with similar condition and market interest.

Therefore, an estimated maximum purchase price for this coin could be 350 euros.