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-), indicating that it is in an acceptable state, but not among the best qualities. This can influence the price, as coins in better condition tend to reach higher prices.

2. Auction History: The coin has been auctioned 26 times, of which it has sold 24 times. This indicates good demand. The average hammer price in previous auctions is 287.43 euros, which can serve as a reference.

3. Previous Auction Prices: Looking at the hammer prices from previous auctions, we can see that:
- In 2020, with a condition of 70, it sold for 260 euros.
- In 2022, with a condition of 75, it sold for 295 euros.
- In 2024, with a condition of 85, it sold for 480 euros.

4. Current Starting Price: The starting price is 350 euros, suggesting that the seller has expectations of a higher price.

Given that the condition of the coin is 70 and considering the price history, an estimated maximum purchase price could be between the average hammer price (287.43 euros) and the starting price (350 euros).

Taking all these factors into account, an estimated maximum purchase price could be around 320 euros. This reflects a balance between the current condition, the price history, and the seller's expectations.