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-), indicating that it is in acceptable shape but not of high quality. This generally affects the price, as coins in better condition tend to fetch higher prices.

2. Auction History:
- The average hammer price for similar coins has been 93.56 euros.
- In the past, coins with the same condition (70) have sold for hammer prices of 31 euros (2018) and 25 euros (2020).
- There are also examples of coins with higher conditions (such as 80 and 85) that have reached hammer prices of 50 euros and 190 euros, respectively.

3. Starting Price and Estimates:
- The current starting price is 25 euros, which is relatively low compared to the average hammer price.
- The average starting price for similar coins is 78.95 euros, suggesting there is potential for an increase in the hammer price.

4. Recent Trends: In recent auctions, hammer prices have exceeded the starting price, indicating a growing interest in these coins.

Based on these factors, an estimated maximum purchase price for this coin could be between 50 and 80 euros, considering its condition and the history of hammer prices. A price of 70 euros could be a reasonable target, as it is in the middle of this range and reflects both its state and market interest.