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. Auction History:
- The average hammer price in previous auctions is 327.26 euros.
- In recent auctions, such as the one in 2023, hammer prices have reached up to 850 euros, although this may be related to a higher condition (95).
- The last auction where this coin was sold with a similar condition (75) had a hammer price of 351 euros.

3. Starting Price and Average Starting Price:
- The current starting price is 325 euros, which is slightly higher than the average starting price of 268.45 euros.

4. Price Trends:
- In previous auctions, hammer prices have varied, but there is a trend for coins with similar conditions to the current one (70) to sell in a range of 260 to 360 euros.

Based on these factors, an estimated maximum purchase price for the coin could be around 360 euros, as this is a price that has been reached in previous auctions for coins of similar condition and is aligned with the highest hammer price recorded in the recent past. However, it is important to keep in mind that collector interest and demand at the time of the auction can also influence the final price.